lovecoding
/
VIP28


			
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #div1{
      width: 300px;
      height: 300px;
      background: antiquewhite;
    }
    #div2{
      width: 200px;
      height: 200px;
      background: red;
    }
    #div3{
      width: 100px;
      height: 100px;
      background: green;
    }
  </style>
</head>
<body>
  <div id="div1">
    <div id="div2">
      <div id="div3"></div>
    </div>
  </div>
  <script>
    var div1 = document.getElementById('div1')
    var div2 = document.getElementById('div2')
    var div3 = document.getElementById('div3')
    // div1.onclick = function(){
    //   console.log('div1')
    // }
    // div2.onclick = function(e){
    //   console.log('div2')
    //   // e.preventDefault()
    //   //阻止事件冒泡
    //   e.stopPropagation()
    // }
    // div3.onclick = function(){
    //   console.log('div3')
    //   //阻止事件冒泡
    //   event.cancelBubble = true
    // }
    //事件冒泡  从里到外执行


      /* 
        参数1  事件名称 字符串 必填
        参数2   执行函数  必填
        参数3   布尔值
      */
      div1.addEventListener('click',function(){
        console.log('div1')
      },false)
      div2.addEventListener('click',function(){
        console.log('div2')
      },false)
      div3.addEventListener('click',function(){
        console.log('div3')
      },false)
      div1.addEventListener('click',function(){
        console.log('div1')
      },true)
      div2.addEventListener('click',function(){
        console.log('div2')
      },true)
      div3.addEventListener('click',function(){
        console.log('div3')
      },true)


      /*  
        从里到外 事件冒泡  fasle
        从外到里 事件捕获  true
        先捕获 后冒泡 先从外到里 然后从里到外
      */
  </script>
</body>
</html>