| 123456789101112131415161718192021222324252627282930313233343536373839404142 | <!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: 200px;      height: 200px;      background: gray;    }    #div2{      width: 100px;      height: 100px;      background: aqua;    }  </style></head><body>  <div id="div1">    <div id="div2"></div>  </div>  <script>    var div1 = document.getElementById('div1')    var div2 = document.getElementById('div2')    div1.onclick = function(e){      // console.log(this)      console.log(e.target)    }    div2.onclick = function(e){      // console.log(this)      console.log(e.target)    }  </script></body></html>
 |