资源描述
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>exercise01.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=GB18030">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
<script type="text/javascript">
var num = prompt("请输入一个整数");
for(var i=1;i<=num;i++){
for(var j=0;j<num-i;j++) {
document.write("   "); }
for(var k=0;k<2*i-1;k++){
document.write("  *"); }
document.write("</br>");
}
for(var i=1;i<=num-1;i++){
for(var j=0;j<i;j++) {
document.write("   ");
}
for(var k=1;k<=2*num-1-2*i;k++){
document.write("  *"); }
document.write("</br>");
}
</script>
</head>
<body>
XueWenJun <br>
</body>
</html>
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