这样不对吗？提示我错误
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script type="text/javascript">
var mystr="86-010-85468578";
document.write(mystr.split("-") + "<br />");
document.write(mystr.split("") + "<br />");
document.write(mystr.split("",3));
</script>
</head>
<body>
</body>
</html>
