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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>打印菱形</title>
</head>
<body style="text-align:center;">
<script type="text/javascript">
var k=prompt("请输入打印的行数：","");
for(var i=1;i<=k;i++){
for(var j=0;j<i;j++){
document.write("* ");
}
document.write("<br/>");
}
for(var i=k-1;i>0;i--){
for(var j=0;j<i;j++){
document.write("* ");
}
document.write("<br/>");
}
</script>
</body>
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js打印菱形
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转载自blog.csdn.net/danqiu2017/article/details/79227299
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