
var str ="<div id='"+id+"' style='position:relativewidth:100pxheight:100pxborder:1px solid red'>"
document.getElementById("目标id").innerHTNL=str
}
<html><head>
<script>
function addNewDiv(){
$("#div_Old").append("<div>新的</div>")
}
</script>
</head>
<body>
<div id="div_Old">原来的</div>
<input type="button" onclick="addNewDiv()" />
</body>
</html>
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