javascript画矩形

<script>
function md(){
 d.style.display="";
 d.setCapture();
 d.onmouseup=d.onlosecapture=mu;
 d.onmousemove=mv;
 d.startX=event.clientX;
 d.startY=event.clientY;
 d.style.left=event.x;
 d.style.top=event.y;
 d.style.width=0;
 d.style.height=0;
  hjs.style.display="none";
}

function mu(){
 d.releaseCapture();
 d.style.display="none";
 hjs.style.display="";
 var x2=event.clientX;
 var y2=event.clientY;
 x=Math.min(d.startX,x2);
 y=Math.min(d.startY,y2);
 x1=Math.max(d.startX,x2);
 y1=Math.max(d.startY,y2);
 with(hjs.style){
  left=x;
  top=y;
  width=x1-x;
  height=y1-y;
 }
}

function mv(){
 var x2=event.clientX;
 var y2=event.clientY;
 x=Math.min(d.startX,x2);
 y=Math.min(d.startY,y2);
 x1=Math.max(d.startX,x2);
 y1=Math.max(d.startY,y2);
 with(d.style){
  left=x;
  top=y;
  width=x1-x;
  height=y1-y;
 }
}
</script>
<body onmousedown=md() >
用鼠标开始画吧
<div style="border:#444 1px solid;position:absolute;overflow:hidden;background-Color:#eee;display:none;" id="d"></div>
<div style="border:#000 1px solid;position:absolute;overflow:hidden;background-Color:#000;display:none;" id="hjs"></div>
</body>

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