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老师批语：
while循环 九九乘法表
<!DOCTYPE html>
<html>
<head>
<title>hello world!</title>
</head>
<body>
<script type="text/javascript">
var a=1;
while(a<=9){
var b=1;
while(b<=a){
document.write(b+'X'+a+'='+(a*b)+' ');
b++
}
a++
document.write('<br>');
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
while循环三角形
<!DOCTYPE html>
<html>
<head>
<title>hello world!</title>
</head>
<body>
<script type="text/javascript">
var a=1;
while(a<=10){
var b=1;
while(b<=a){
document.write('*');
b++
}
a++
document.write('<br>');
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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