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<!DOCTYPE HTML>
<html>
<head>
<meta charset="gbk" />
<title></title>
</head>
<body>
<div id="placeholder"></div>
<script type="text/javascript">
var placeholder = document.getElementById("placeholder");
var description = "test";
placeholder.innerHTML = description;
// 或者
var textNode = document.createTextNode('test123');
placeholder.appendChild( textNode )
</script>
</body>
</html>