div漂浮操作

<div style="width: 34px; height: 22px; background-color: #FF0000; position:absolute;
        display: block; top: 365px; left: 636px;" id="xy1">
    </div>
    
  
<div class="block" id="block1"  style=" width :300px; height: 200px; left:16px; top:66px; " onclick="TestPointXY();">塊一</div>
 

 

 function TestPointXY()
    {
        
          var t1=document.getElementById("block1");
          var t2=document.getElementById("block2");
          var t3=document.getElementById("block3");         
          var t=document.getElementById("xy1");       
           
          t.style.left=parseInt(t1.style.left)+parseInt(t1.style.width)-parseInt(t.style.width);         
          t.style.top=t1.style.top;
          t.style.zIndex=1000;
       
    }