用JavaScript实现层在指定位置显示

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<html>
       <script type="text/javascript">
    function show1(event)
    {
       var sourceObj=event.srcElement||event.target;
       var targetObj=document.getElementById("test1");
       targetObj.style.left=sourceObj.offsetLeft;
       targetObj.style.top=sourceObj.offsetTop+sourceObj.offsetHeight;
    }
   
   
    function show2(event)
    {
       var sourceObj=event.srcElement||event.target;
       var targetObj=document.getElementById("test2");
       targetObj.style.left=sourceObj.offsetLeft+sourceObj.offsetWidth;
       targetObj.style.top=sourceObj.offsetTop;
    }

     function show3(event)
    {
       var sourceObj=event.srcElement||event.target;
       var targetObj=document.getElementById("test3");
       targetObj.style.left=sourceObj.offsetLeft+sourceObj.offsetWidth;
       targetObj.style.top=sourceObj.offsetTop+sourceObj.offsetHeight;
    }
       </script>


<body>

   <input name="button1" type="button" value="层测试1" onClick="show1(event);">
   <input name="button2" type="button" value="层测试2" onClick="show2(event);">
   <input name="button3" type="button" value="层测试3" onClick="show3(event);">
   <br>
   <br><br>
          <div id="test1" style="position:absolute;height:60; width:120;border:1px #feda32 solid;background-color:#33aad2;">
    层1
          </div>
   
 <br><br><br>  
          <div id="test2" style="position:absolute;width:120;height:60;border:1px #feda32 solid;background-color:#33aad2;">
   层2
          </div>
   
 <br><br><br>  
          <div id="test3" style="position:absolute;width:120;height:60;border:1px #feda32 solid;background-color:#33aad2;">
   层3
          </div>
 
</body>
<html>

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