js 冒泡捕获-CFANZ编程社区

<!DOCTYPE html>
<html lang="zh">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title></title>
  <style>
    .div1{
      width:400px;
      height:400px;
      background-color: green;
    }
    .div2{
      width:300px;
      height:300px;
      background-color: red;
    }
    .div3{
      width:200px;
      height:200px;
      background-color: blue;
    }
        .div4{
      width:100px;
      height:100px;
      background-color: #CCCCCC;
    }
  </style>
</head>
<body>
  <div class="div1 aa">div1
      <div class="div2 aa">div2
        <div class="div3 aa">div3
          <div class="div4 aa">
          div4
        </div>
      </div>
    </div>
  </div>
  <script>
    var divs=document.querySelectorAll('.aa')
    //console.log(divs)     
    for(const div of divs){
      div.addEventListener("click",function(event){
        console.log(this.className) //都是默认时冒泡 未阻止 点击 div4时打印 div4 aa div3 aa...div1 aa 若开启阻止则点击div4时只打印div4 aa 
        event.stopPropagation();//阻止冒泡 捕获  捕获true 未阻止 点击 div4时打印 div1 aa div2 aa...div4 aa 若开启阻止则点击任何div时只打印div1 aa
      },true)//true是捕获 默认是false冒泡 
    }
    
  </script>
</body>
</html>