<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
span {
width: 21px;
height: 21px;
display: inline-block;
}
</style>
</head>
<body>
<!-- 菱形-->
<script>
//设置上等腰三角形总行数rows
var rows = 8;
//循环输出每一行
for (var n = 1; n <= rows; n++) {
//输出空格
for (var j = 1; j <= rows - n; j++) {
document.write("<span> </span>");
}
//输出 *
for (var s = 1; s < 2 * n; s++) {
document.write("<span>*</span>");
}
//换行
document.write("<br/>");
}
//设置下等腰三角形总行数row //设置row = rows - 1的目的为使菱形中间最长的一行不重复
var row = rows - 1;
//循环输出每一行
for (var n = 1; n <= row; n++) {
//输出空格
for (var j = 1; j <= n; j++) {
document.write("<span> </span>");
}
//输出 *
for (var s = 1; s < 2 * (row - n + 1); s++) {
document.write("<span>*</span>");
}
//换行
document.write("<br/>");
}
</script>
</body>
</html>
