<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>二维数组</title>
<script type="text/javascript">
var mynum=[[1,2,3][1,2,3,4,5,6]]=6*21;
</script>
</head>
<body>
</body>
</html>
能用一维数组解决的，尽量不要考虑那么复杂，实际开发中倾向于便于理解和维护，写个for就好了