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老师批语：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>for循环 菱形案例</title>
<script type="text/javascript">
var n = parseInt(prompt("请输入菱形的层数一半"));
for (var i = 1; i <= n; i++)
{
for (var k = 1 ;k <= n - i;k++)
{
document.write(" ");
};
for (var j = 1; j <= 2 * i - 1; j++)
{
document.write("△");
};
document.write("<br>");
};
for (var x = 1;x <= n - 1;x++)
{
for (var y = 1;y <= x;y++)
{
document.write(" ");
};
for (var z = 2 * (n - x) - 1; z >= 1; z--)
{
document.write("▽");
};
document.write("<br>");
};
</script>
</head>
<body>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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