<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript">
for(var i=0;i<6;i++){
for(var k=0;k<6-i-1;k++){
document.writeln(" ");
}
for(var j=0;j<=(2*i-1)+1;j++){
document.writeln("*");
}
document.writeln("<br/>");
}
</script>
</head>
//居中
<body style="text-align: center;">
</body>
</html>
原文：http://www.cnblogs.com/Tiramisu001/p/5994149.html