这样为什么没有输出URL
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>location</title>
</head>
<script type="text/javascript">
//window.location.herf="" //定义属性 ";
//document.write(window.location.herf);
var b=location.href;
document.write(b);
</script>
</head>
<body>
</body>
</html>
