<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>输出正方形</title>
</head>
<body>
<div style="text-align:center;">
<script type="text/javascript">
<!--
var num=prompt("请输入正方形的行数：","");
for(i=0;i<num;i++){
for(j=0;j<num;j++){
document.write("# ");
}
document.write("<br/>");
}
-->
</script>
</div>
</body>
</html>
js打印正方形
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转载自blog.csdn.net/danqiu2017/article/details/79227874
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