javascript 正则表达式问题 - 编程论坛

<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <script language ="javascript">
var top=/^huawei/;
var textstring="huawei,nihao!";
var result=top .test (textstring);
document.write(result);
if(result)
document .write("匹配");
else
alert("不匹配");
</script>
    </div>
    </form>
</body>
</html>
运行后，浏览器没反应，问题在哪，谢谢