lovecoding
/
VIP24


			
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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>
    *{
      margin: 0;
      padding: 0;
    }
    #div1{
      width: 300px;
      height: 300px;
      background: black;
    }
    #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(){
    //   console.log(div2)
    //   div2.style.background = 'white'
    //   //阻止事件冒泡
    //   event.stopPropagation()
    // }
    // div3.onclick = function(){
    //   console.log(div3)
    //   //阻止事件冒泡
    //   event.cancelBubble = true
    // }
    //由内到外  是事件冒泡

    //参数一  事件名称 字符串 必填项
    //参数二  执行函数 必填项
    //参数三  布尔值  可空
    div1.addEventListener('click',function(){
      console.log('我是div1')
    })
    div2.addEventListener('click',function(){
      console.log('我是div2')
    })
    div3.addEventListener('click',function(){
      console.log('我是div3')
    })
    div1.addEventListener('click',function(){
      console.log('我是div1')
    },true)
    div2.addEventListener('click',function(){
      console.log('我是div2')
    },true)
    div3.addEventListener('click',function(){
      console.log('我是div3')
    },true)


    /* 
    从里到外  事件冒泡  false
    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>