JavaScript 实现简单弹出窗口与元素信息获取

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    body{
      /*margin: 0;*/
    }
    #div1{
      width: 100px;
      height: 100px;
      border: 1px solid red;
    }
  </style>
</head>
<body>
<div id="div1" onmouseover="getInfo(this)" onmouseout="this.innerHTML=''">

</div>
<button onclick="getInfo()">获取div信息</button>

<hr/>
<a href="111.html" rel="external nofollow" target="_blank">我是超链接</a>
<br/><br/>
<button onclick="myopen1()">新窗口111111111</button>
<button onclick="myopen2()">新窗口222222222</button>
<button onclick="myopen3()">新窗口333333333</button>

<hr/>
<button onclick="myclose()">关掉子窗口</button>

<script>
  var mywin;
  function myclose(){
    if(mywin)
      mywin.close();
  }
  function myopen3(){
    mywin = window.open('333.html', 'news', 'resizable=no');
  }
  function myopen2(){
    mywin = window.open('222.html', 'news', 'resizable=no');
  }
  function myopen1(){
    mywin = window.open('111.html', 'news', 'resizable=no');
  }
  function getInfo(obj){
//    var div1 = document.getElementById('div1');

    obj.innerHTML = obj.offsetWidth+',,'+obj.offsetHeight;
    obj.innerHTML += '<br>'+obj.offsetLeft+',,'+obj.offsetTop;
    // offsetXXX 只能读取不能赋值修改
    obj.offsetWidth = obj.offsetWidth+100;
    // 下面的属性已经不能用了
//    obj.innerHTML += '<br>'+obj.innerWidth+',,'+obj.innerHeight;
  }
</script>
</body>
</html>