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                            > 1. 更改React的state屬性時，會觸發哪些生命周期鉤子?

shouldComponentUpdate 如果返回true, 接著觸發
componentWillUpdate 和 render 和 componentDidUpdate
補充: 如果是父向我傳入的值, 還會觸發子組件的componentWillReceiveProps

 > 2. React 中 keys 的作用是什么?

Keys 是Diff算法中元素的Key值來判斷哪些標簽需要重新渲染,優化性能
注意同級元素唯一性key,

.>3. React構建組件的方法有幾種?

 * React.createClass()的方式
 * 構造函數的方法
 * class 集成 React.Component的方式


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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