帮我找下问题所在，谢谢大家了！！！
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>数组</title>
<script type="text/javascript">
var arr = ['*','##',"***","&&","****","##*"];
arr[7] = "**";
alert("数组长度"+arr.length);//显示数组长度
document.write(arr[0]+<br/>);
document.write(arr[7]+<br/>);
document.write(arr[2]+<br/>);
document.write(arr[4]+<br/>);//将数组内容输出，完成达到的效果。
</script>
</head>
<body>
</body>
</html>
