<!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 myarr=new Array()
for(var i=0;i<3;i++)
{
myarr[i]=new Array();
for (var j=0;j<6;j++)
{
myarr[i][j]=i+j;
document.write("myarr[i][j]");
}
}
//document.write(myarr);
</script>
</head>
<body>
</body>
</html>把14行改成document.write(myarr[i][j]);
你多加了双引号，变成了字符串
document.write（“myarr[i][j]”)改成document.write(myarr[i][j])无双引号