文本框运行html/js

<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>文本框运行html/js代码</title>
<script>
window.onload=function(){
var oTxt=document.getElementById(“txt1″);
var oBtn=document.getElementById(“btn1″);

oBtn.onclick=function(){
document.write(“aa”);
var oNewWin=window.open(“about:blank”);
oNewWin.document.write(oTxt.value);
}
}
</script>
</head>
<body>
</body>
<textarea id=”txt1″ rows=”10″ cols=”40″></textarea><br/>
<input id=”btn1″ type=”button” value=”运行” >
</html>