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>