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怎样交一幅图片拖进表格中
<body>
<img id=s src="csdn.gif" onmousedown="did(this)">
<script>
var ms;
function did(obj){
ms=obj;
event.srcElement.setCapture();
}
function document.onmouseup(){
if(ms&&document.elementFromPoint(event.x,event.y).tagName=="TD"){
event.srcElement.releaseCapture();
document.elementFromPoint(event.x,event.y).appendChild(ms)
}
ms=null;
}
</script>
<table border="1" width="100">
<tr>
<td width="50%"> </td>
<td width="50%"> </td>
</tr>
<tr>
<td width="50%"> </td>
<td width="50%"> </td>
</tr>
</table>
