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                                1. document.addEventListener('touchstart')  禁止掉大部分事件的默認行為，能否成功阻止與DOM事件的冒泡有關聯，cancelable為true時才能阻止
        1. 文字選中
        2. 瀏覽器橡皮筋效果
    2. 真機與瀏覽器模擬調試部分效果不同
    3. 事件相關
        1. PC端的事件可以在移動端觸發
        2. PC端事件有300毫秒延遲
        3. 移動端事件不會有延遲
    4. 事件對象信息
        1. changedTouches：觸發當前事件的手指列表
        2. targetTouches：觸發當前事件時元素上的手指列表
        3. touches：觸發當前事件時屏幕上的手指列表
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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