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React在ES6中的用法
阅读量：4087 次
发布时间：2019-05-25

本文共 58821 字，大约阅读时间需要 196 分钟。

写在前面

http://jafeney.com/2016/04/22/2016-04-22-react-ES6/不管是多么不乐意待见这个不速之客，但ES6已经一点点渗透进了我的生活里，就连我最爱的React到React Native，默认都把ES6做为首选标准。这是FaceBook有计划、有声势地要把ES6推起来，请问还有谁有狗胆站住来堵着路不走。所以我毅然捧着阮一峰老师的《ES6标准入门》在一旁看了起来……那好，今天就谈谈如何把React用ES6愉快地跑起来。

入门级Demos

先来几个简单的demo体验一把。注意，例子里ES5的require请通过browserfiy或webpack来实现，如果你还不会用这两样东西，请出门后往前看。

“Hello,XXX”输出

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var React = require('react');     
          
          
     
            var HelloMessage = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (
Hello,{this.props.name}!
);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
     
          
     
            				
             
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class HelloMessage extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return 
Hello {this.props.name}
;     
          
     
              }     
          
     
            }     
          
     
            class Output extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
          
     
                return (     
          
     
                  
       
     
          
     
                      
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default Output;

数组遍历显示

ES5写法：

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var React = require('react');     
          
     
            var RepeatArray = React.createClass({     
          
     
            	render: function() {     
          
     
            		var names = ['Alice', 'Emily', 'Kate'];     
          
     
            		var arrs = [     
          
     
            			
Hello World
,     
          
     
            			
React is awesome
     
          
     
            		];     
          
     
            		return (     
          
     
            			
       
             
          
     
            			{arr}     
          
     
            			{     
          
     
            				names.map(function (name) {return 
        
         Hello, {name}!
        
;});		     
          
     
            			}     
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = RepeatArray;

ES6写法：

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import React,{Component} from 'react';     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                var arr = [     
          
     
                  
Hello world!
,     
          
     
                  
React is awesome
,     
          
     
                ];     
          
     
                var names = ['Alice', 'Emily', 'Kate'];     
          
     
                return (     
          
     
                  
       
             
          
     
                  {arr}     
          
     
                  {     
          
     
                    names.map((name) =>{return 
        
         Hello, {name}!
        
;} )     
          
     
                  }     
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

ol与li的实现

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var React = require('react');     
          
     
            var RepeatLi = React.createClass({     
          
     
            	render: function() {     
          
     
            		return(     
          
     
            			
       
                 
              
         
                				{     
              
         
                					this.props.children.map(function(child) {     
              
         
                						return 
            
  1. {child}
    2. ;     
              
         
                					});     
              
         
                				}     
              
         
                			
           
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
     
          
     
            				
             
          
     
            					
         hello     
          
     
            					
         world     
          
     
            				
             
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class RepeatLi extends Component{     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
                 
              
         
                      {     
              
         
                        this.props.children.map((child)=>{return 
            
  1. {child}
    2. })     
              
         
                      }     
              
         
                      
           
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
     
          
          
     
                  
             
          
     
                    
         hello     
          
     
                    
         world     
          
     
                  
             
          
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

Click事件

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var React = require('react');     
          
     
            var MyComponent = React.createClass({     
          
     
            	handleClick: function() {     
          
     
            		React.findDOMNode(this.refs.myTextInput).focus();     
          
     
            	},     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
     
          
     
            				
             
          
     
            				
             
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
     
          
     
            			    
             
          
     
            		    
       
     
          
     
            		);     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class FocusText extends Component{     
          
     
              handleClick(){     
          
     
                React.findDOMNode(this.refs.myText).focus();     
          
     
              }     
          
     
              render(){     
          
     
                return(     
          
     
                  
       
     
          
     
                    
             
          
     
                    
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
     
          
     
                  
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

State的用法，以toggel显示文字为例

ES5写法：

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var React = require('react');     
          
     
            var LikeButton = React.createClass({     
          
     
            	getInitialState: function() {     
          
     
            		return {liked: false};     
          
     
            	},     
          
     
            	handleClick: function(e) {     
          
     
            		this.setState({liked: !this.state.liked});     
          
     
            	},     
          
     
            	render: function() {     
          
     
            		var text = this.state.liked ? 'like' : 'haven\'t liked';     
          
     
            		return (     
          
     
            			
     
          
     
            				You {text} this.Click to toggle.     
          
     
             			
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (
       
        
       
);     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class StateUse extends Component{     
          
     
              constructor(){     
          
     
                super();     
          
     
                this.state={     
          
     
                  like:true     
          
     
                }     
          
     
              }     
          
     
              handleClick(){     
          
     
                this.setState({like:!this.state.like});     
          
     
              }     
          
     
              render(){     
          
     
                var text = this.state.like?'Like':"Unlike";     
          
     
                return(     
          
     
                  
       
     
          
     
                    
        
     
          
     
                    You {text} this.Click the toggle;     
          
     
                    
     
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
     
          
     
                  
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

onChange事件，以及变量值的同步

ES5写法：

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var React = require('react');     
          
     
            var InputComponent = React.createClass({     
          
     
            	getInitialState: function() {     
          
     
            		return {value: 'Hello!'};     
          
     
            	},     
          
     
            	handleChange: function(e) {     
          
     
            		this.setState({value: e.target.value})     
          
     
            	},     
          
     
            	render: function() {     
          
     
            		var value = this.state.value;     
          
     
            		return (     
          
     
            			
       
     
          
     
            				
             
          
     
            				
        
{value}
     
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (
       
        
       
)     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class AsyncText extends Component{     
          
     
              constructor(){     
          
     
                  super();     
          
     
                  this.state={     
          
     
                    value:'Hello!'     
          
     
                  }     
          
     
              }     
          
     
              handleChange(e){     
          
     
                this.setState({value:e.target.value});     
          
     
              }     
          
     
              render(){     
          
     
                var value= this.state.value;     
          
     
                return(     
          
     
                  
       
     
          
     
                    
             
          
     
                    
        
     
          
     
                      {value}     
          
     
                    
     
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
            
          
     
                       
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

定时任务事件的嵌入

ES5写法：

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var React = require('react');     
          
     
            var Hello = React.createClass({     
          
     
            	getInitState: function() {     
          
     
            		return {     
          
     
            			opacity: 1.0     
          
     
            		};     
          
     
            	},     
          
     
            	componentDidMount: function() {     
          
     
            		this.timer = setInterval (function() {     
          
     
            			var opacity = this.state.opacity;     
          
     
            			opacity -= .05;     
          
     
            			if (opacity < 0.1) {     
          
     
            				opacity = 1.0;     
          
     
            			}     
          
     
            			this.setState({     
          
     
            				opacity: opacity     
          
     
            			});     
          
     
            		}.bind(this), 100);     
          
     
            	},     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
             
          
     
            				Hello {this.props.name}     
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (
       
        
       
);     
          
     
            	}     
          
     
            });

ES6写法：

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import React,{Component} from 'react';     
          
     
            class OpacityWord extends Component{     
          
     
              constructor(){     
          
     
                super();     
          
     
                this.state={     
          
     
                  opacity:1.0     
          
     
                }     
          
     
              }     
          
     
              componentWillMount(){     
          
     
                let time  =  setInterval(()=>{     
          
     
                  let opacity = this.state.opacity;     
          
     
                  opacity -= 0.5;     
          
     
                  if (opacity<0.1) {     
          
     
                    opacity=1.0;     
          
     
                  }     
          
     
                  this.setState({opacity:opacity});     
          
     
                }.bind(this),100);     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
             
          
     
                    Hello, {this.props.name}!     
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
          
     
            }     
          
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
     
          
     
                   
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

从服务端获取数据

ES5写法：

1     
          
     
            2     
          
     
            3     
          
     
            4     
          
     
            5     
          
     
            6     
          
     
            7     
          
     
            8     
          
     
            9     
          
     
            10     
          
     
            11     
          
     
            12     
          
     
            13     
          
     
            14     
          
     
            15     
          
     
            16     
          
     
            17     
          
     
            18     
          
     
            19     
          
     
            20     
          
     
            21     
          
     
            22     
          
     
            23     
          
     
            24     
          
     
            25     
          
     
            26     
          
     
            27     
          
     
            28     
          
     
            29     
          
     
            30     
          
     
            31     
          
     
            32     
          
     
            33     
          
     
            34     
          
     
            35
 
var React = require('react');     
          
     
            var UserGist = React.createClass({     
          
     
            	getInitState: function() {     
          
     
            		return {     
          
     
            			username: '',     
          
     
            			lastGistUrl: ''     
          
     
            		};     
          
     
            	},     
          
     
            	componentDidMount: function() {     
          
     
            		$.get(this.props.source, function(result) {     
          
     
            			var lastGist = result[0];     
          
     
            			this.setState({     
          
     
            				username: lastGist.owner.login,     
          
     
            				lastGistUrl: lastGist.html_url     
          
     
            			});     
          
     
            		}.bind(this));     
          
     
            	},     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
             
          
     
            				{this.state.username}s last gist is 
         here .     
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });     
          
          
     
            module.exports = React.createClass({     
          
     
            	render: function() {     
          
     
            		return (     
          
     
            			
       
     
          
     
            				
             
          
     
            			
       
     
          
     
            		);     
          
     
            	}     
          
     
            });

ES6写法：

1     
          
     
            2     
          
     
            3     
          
     
            4     
          
     
            5     
          
     
            6     
          
     
            7     
          
     
            8     
          
     
            9     
          
     
            10     
          
     
            11     
          
     
            12     
          
     
            13     
          
     
            14     
          
     
            15     
          
     
            16     
          
     
            17     
          
     
            18     
          
     
            19     
          
     
            20     
          
     
            21     
          
     
            22     
          
     
            23     
          
     
            24     
          
     
            25     
          
     
            26     
          
     
            27     
          
     
            28     
          
     
            29     
          
     
            30     
          
     
            31     
          
     
            32     
          
     
            33     
          
     
            34     
          
     
            35     
          
     
            36     
          
     
            37     
          
     
            38     
          
     
            39     
          
     
            40     
          
     
            41     
          
     
            42
 
import React,{Component} from 'react';     
          
     
            class UserGist extends Component{     
          
     
              constructor(){     
          
     
                super();     
          
     
                this.state={     
          
     
                  username:'',     
          
     
                  lastGistUrl:''     
          
     
                }     
          
     
              }     
          
     
              componentWillMount(){     
          
     
                $.get(this.props.source, function(result) {     
          
     
                  var lastGist = result[0];     
          
     
                  //if (this.isMounted()) {     
          
     
                    this.setState({     
          
     
                      username: lastGist.owner.login,     
          
     
                      lastGistUrl: lastGist.html_url     
          
     
                    });     
          
     
                  //}     
          
     
                }.bind(this));     
          
     
              }     
          
     
              render(){     
          
     
                return(     
          
     
                  
       
             
          
     
                    {this.state.username} ..     
          
     
                    
        here     
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            class RepeatArray extends Component{     
          
     
              constructor() {     
          
     
                super();     
          
     
              }     
          
     
              render(){     
          
     
                return (     
          
     
                  
       
     
          
     
                  
             
          
     
                  
       
     
          
     
                );     
          
     
              }     
          
     
            }     
          
     
            export default RepeatArray;

React Native实战

写一个简单的页面，支持输入关键字然后以列表形式呈现github里搜索出来的结果。效果如下：


ES5写法：

1     
          
     
            2     
          
     
            3     
          
     
            4     
          
     
            5     
          
     
            6     
          
     
            7     
          
     
            8     
          
     
            9     
          
     
            10     
          
     
            11     
          
     
            12     
          
     
            13     
          
     
            14     
          
     
            15     
          
     
            16     
          
     
            17     
          
     
            18     
          
     
            19     
          
     
            20     
          
     
            21     
          
     
            22     
          
     
            23     
          
     
            24     
          
     
            25     
          
     
            26     
          
     
            27     
          
     
            28     
          
     
            29     
          
     
            30     
          
     
            31     
          
     
            32     
          
     
            33     
          
     
            34     
          
     
            35     
          
     
            36     
          
     
            37     
          
     
            38     
          
     
            39     
          
     
            40     
          
     
            41     
          
     
            42     
          
     
            43     
          
     
            44     
          
     
            45     
          
     
            46     
          
     
            47     
          
     
            48     
          
     
            49     
          
     
            50     
          
     
            51     
          
     
            52     
          
     
            53     
          
     
            54     
          
     
            55     
          
     
            56     
          
     
            57     
          
     
            58     
          
     
            59     
          
     
            60     
          
     
            61     
          
     
            62     
          
     
            63     
          
     
            64     
          
     
            65     
          
     
            66     
          
     
            67     
          
     
            68     
          
     
            69     
          
     
            70     
          
     
            71     
          
     
            72     
          
     
            73     
          
     
            74     
          
     
            75     
          
     
            76     
          
     
            77     
          
     
            78     
          
     
            79     
          
     
            80     
          
     
            81     
          
     
            82     
          
     
            83     
          
     
            84     
          
     
            85     
          
     
            86     
          
     
            87     
          
     
            88     
          
     
            89     
          
     
            90     
          
     
            91     
          
     
            92     
          
     
            93     
          
     
            94     
          
     
            95     
          
     
            96     
          
     
            97     
          
     
            98     
          
     
            99     
          
     
            100     
          
     
            101     
          
     
            102     
          
     
            103     
          
     
            104     
          
     
            105     
          
     
            106     
          
     
            107     
          
     
            108     
          
     
            109     
          
     
            110     
          
     
            111     
          
     
            112     
          
     
            113     
          
     
            114     
          
     
            115     
          
     
            116     
          
     
            117     
          
     
            118     
          
     
            119     
          
     
            120     
          
     
            121     
          
     
            122     
          
     
            123     
          
     
            124     
          
     
            125     
          
     
            126     
          
     
            127     
          
     
            128     
          
     
            129     
          
     
            130     
          
     
            131     
          
     
            132     
          
     
            133     
          
     
            134     
          
     
            135     
          
     
            136
 
'use strict';     
          
     
            var React = require('react-native');     
          
     
            var {     
          
     
                Image,     
          
     
                ListView,     
          
     
                TextInput,     
          
     
                AppRegistry,     
          
     
                Component,     
          
     
                StyleSheet,     
          
     
                Text,     
          
     
                View,     
          
     
            } = React;     
          
          
     
            var BASE_URL = "https://api.github.com/search/repositories?q=";     
          
          
     
            var customView = React.createClass({     
          
          
     
                getInitialState: function() {     
          
     
                    return {     
          
     
                        dataSource: new ListView.DataSource({     
          
     
                            rowHasChanged: (row1, row2) => row1 !== row2,     
          
     
                        }),     
          
     
                    };     
          
     
                },     
          
          
     
                render: function() {     
          
     
                    if (this.state.dataSource.getRowCount() === 0) {     
          
     
                        console.log('YES');     
          
     
                    }     
          
     
                    var content = this.state.dataSource.getRowCount() === 0 ?     
          
     
                    
       
             
          
     
                        Please enter a search term to see results.     
          
     
                    
        :     
          
     
                    
       ;     
          
          
     
                    return (     
          
     
                        
            
          
     
                            
        
              
          
     
                            {content}     
          
     
                        
        
            
          
     
                    );     
          
     
                },     
          
          
     
                onSearchChange: function(event: Object) {     
          
     
                    var searchTerm = event.nativeEvent.text.toLowerCase();     
          
     
                    var queryURL = BASE_URL + encodeURIComponent(searchTerm);     
          
          
     
                    fetch(queryURL)     
          
     
                        .then((response) => response.json())     
          
     
                        .then((responseData) => {     
          
     
                            if (responseData.items) {     
          
     
                                this.setState({     
          
     
                                    dataSource: this.state.dataSource.cloneWithRows(responseData.items),     
          
     
                                });     
          
     
                            }     
          
     
                        }).done();     
          
     
                },     
          
          
     
                renderRow: function(repo: Object) {     
          
     
                    return (     
          
     
                        
            
          
     
                            
             
          
     
                                
              
          
     
                                
              
          
     
                                    
          
                
          
     
                                        {repo.name}     
          
     
                                    
               
          
     
                                    
          
                
          
     
                                        {repo.owner.login}     
          
     
                                    
               
          
     
                                
              
          
     
                                
              
          
     
                            
             
          
     
                        
            
          
     
                    );     
          
     
                },     
          
     
            });     
          
          
     
            var styles = StyleSheet.create({     
          
     
                container: {     
          
     
                    flex: 1,     
          
     
                    backgroundColor: '#ffffff',     
          
     
                },     
          
     
                searchBarInput: {     
          
     
                    marginTop: 30,     
          
     
                    padding: 5,     
          
     
                    fontSize: 15,     
          
     
                    height: 30,     
          
     
                    backgroundColor: '#EAEAEA',     
          
     
                },     
          
     
                row: {     
          
     
                    alignItems: 'center',     
          
     
                    backgroundColor: 'white',     
          
     
                    flexDirection: 'row',     
          
     
                    padding: 5,     
          
     
                },     
          
     
                cellBorder: {     
          
     
                    backgroundColor: 'rgba(0,0,0,0.1)',     
          
     
                    height: 1,     
          
     
                    marginLeft: 4,     
          
     
                },     
          
     
                profPic: {     
          
     
                    width: 50,     
          
     
                    height: 50,     
          
     
                },     
          
     
                title: {     
          
     
                    fontSize: 20,     
          
     
                    marginBottom: 8,     
          
     
                    fontWeight: 'bold',     
          
     
                },     
          
     
                subTitle: {     
          
     
                    fontSize: 16,     
          
     
                    marginBottom: 8,     
          
     
                },     
          
     
                textContainer: {     
          
     
                    paddingLeft: 10,     
          
     
                },     
          
     
                blankText: {     
          
     
                    padding: 10,     
          
     
                    fontSize: 20,     
          
     
                }     
          
     
            });     
          
          
     
            AppRegistry.registerComponent('customView', () => customView);

ES6写法：

1     
          
     
            2     
          
     
            3     
          
     
            4     
          
     
            5     
          
     
            6     
          
     
            7     
          
     
            8     
          
     
            9     
          
     
            10     
          
     
            11     
          
     
            12     
          
     
            13     
          
     
            14     
          
     
            15     
          
     
            16     
          
     
            17     
          
     
            18     
          
     
            19     
          
     
            20     
          
     
            21     
          
     
            22     
          
     
            23     
          
     
            24     
          
     
            25     
          
     
            26     
          
     
            27     
          
     
            28     
          
     
            29     
          
     
            30     
          
     
            31     
          
     
            32     
          
     
            33     
          
     
            34     
          
     
            35     
          
     
            36     
          
     
            37     
          
     
            38     
          
     
            39     
          
     
            40     
          
     
            41     
          
     
            42     
          
     
            43     
          
     
            44     
          
     
            45     
          
     
            46     
          
     
            47     
          
     
            48     
          
     
            49     
          
     
            50     
          
     
            51     
          
     
            52     
          
     
            53     
          
     
            54     
          
     
            55     
          
     
            56     
          
     
            57     
          
     
            58     
          
     
            59     
          
     
            60     
          
     
            61     
          
     
            62     
          
     
            63     
          
     
            64     
          
     
            65     
          
     
            66     
          
     
            67     
          
     
            68     
          
     
            69     
          
     
            70     
          
     
            71     
          
     
            72     
          
     
            73     
          
     
            74     
          
     
            75     
          
     
            76     
          
     
            77     
          
     
            78     
          
     
            79     
          
     
            80     
          
     
            81     
          
     
            82     
          
     
            83     
          
     
            84     
          
     
            85     
          
     
            86     
          
     
            87     
          
     
            88     
          
     
            89     
          
     
            90     
          
     
            91     
          
     
            92     
          
     
            93     
          
     
            94     
          
     
            95     
          
     
            96     
          
     
            97     
          
     
            98     
          
     
            99     
          
     
            100     
          
     
            101     
          
     
            102     
          
     
            103     
          
     
            104     
          
     
            105     
          
     
            106     
          
     
            107     
          
     
            108     
          
     
            109     
          
     
            110     
          
     
            111     
          
     
            112     
          
     
            113     
          
     
            114     
          
     
            115     
          
     
            116     
          
     
            117     
          
     
            118     
          
     
            119     
          
     
            120     
          
     
            121     
          
     
            122     
          
     
            123     
          
     
            124     
          
     
            125     
          
     
            126     
          
     
            127     
          
     
            128     
          
     
            129     
          
     
            130     
          
     
            131     
          
     
            132     
          
     
            133     
          
     
            134     
          
     
            135     
          
     
            136
 
import React, {     
          
     
                Image,     
          
     
                ListView,     
          
     
                TextInput,     
          
     
                AppRegistry,     
          
     
                Component,     
          
     
                StyleSheet,     
          
     
                Text,     
          
     
                View,     
          
     
            }     
          
     
            from 'react-native';     
          
     
            const BASE_URL = "https://api.github.com/search/repositories?q=";     
          
          
     
            class customView extends Component {     
          
          
     
                constructor() {     
          
     
                    super();     
          
     
                }     
          
          
     
                state = {     
          
     
                    dataSource: new ListView.DataSource({     
          
     
                        rowHasChanged: (row1, row2) => row1 !== row2,     
          
     
                    }),     
          
     
                }     
          
          
     
                render() {     
          
     
                    if (this.state.dataSource.getRowCount() === 0) {     
          
     
                        console.log('YES');     
          
     
                    }     
          
     
                    var content = this.state.dataSource.getRowCount() === 0 ?     
          
     
                    
       
             
          
     
                        Please enter a search term to see results.     
          
     
                    
        :     
          
     
                    
       ;     
          
          
     
                    return (     
          
     
                        
            
          
     
                            
        
              
          
     
                            {content}     
          
     
                        
        
            
          
     
                    );     
          
     
                }     
          
          
     
                onSearchChange(event: Object) {     
          
     
                    var searchTerm = event.nativeEvent.text.toLowerCase();     
          
     
                    var queryURL = BASE_URL + encodeURIComponent(searchTerm);     
          
          
     
                    fetch(queryURL)     
          
     
                        .then((response) => response.json())     
          
     
                        .then((responseData) => {     
          
     
                            if (responseData.items) {     
          
     
                                this.setState({     
          
     
                                    dataSource: this.state.dataSource.cloneWithRows(responseData.items),     
          
     
                                });     
          
     
                            }     
          
     
                        }).done();     
          
     
                }     
          
          
     
                renderRow(repo: Object) {     
          
     
                    return (     
          
     
                        
            
          
     
                            
             
          
     
                                
              
          
     
                                
              
          
     
                                    
          
                
          
     
                                        {repo.name}     
          
     
                                    
               
          
     
                                    
          
                
          
     
                                        {repo.owner.login}     
          
     
                                    
               
          
     
                                
              
          
     
                                
              
          
     
                            
             
          
     
                        
            
          
     
                    );     
          
     
                }     
          
     
            }     
          
          
     
            const styles = StyleSheet.create({     
          
     
                container: {     
          
     
                    flex: 1,     
          
     
                    backgroundColor: '#ffffff',     
          
     
                },     
          
     
                searchBarInput: {     
          
     
                    marginTop: 30,     
          
     
                    padding: 5,     
          
     
                    fontSize: 15,     
          
     
                    height: 30,     
          
     
                    backgroundColor: '#EAEAEA',     
          
     
                },     
          
     
                row: {     
          
     
                    alignItems: 'center',     
          
     
                    backgroundColor: 'white',     
          
     
                    flexDirection: 'row',     
          
     
                    padding: 5,     
          
     
                },     
          
     
                cellBorder: {     
          
     
                    backgroundColor: 'rgba(0,0,0,0.1)',     
          
     
                    height: 1,     
          
     
                    marginLeft: 4,     
          
     
                },     
          
     
                profPic: {     
          
     
                    width: 50,     
          
     
                    height: 50,     
          
     
                },     
          
     
                title: {     
          
     
                    fontSize: 20,     
          
     
                    marginBottom: 8,     
          
     
                    fontWeight: 'bold',     
          
     
                },     
          
     
                subTitle: {     
          
     
                    fontSize: 16,     
          
     
                    marginBottom: 8,     
          
     
                },     
          
     
                textContainer: {     
          
     
                    paddingLeft: 10,     
          
     
                },     
          
     
                blankText: {     
          
     
                    padding: 10,     
          
     
                    fontSize: 20,     
          
     
                }     
          
     
            });     
          
          
     
            AppRegistry.registerComponent('customView', () => customView);

参考 

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