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老师批语：
<!DOCTYPE html>
<html>
<head>
<title>javaScript</title>
<link rel="icon " type="image/icon" href="">
</head>
<body>
<script type="text/javascript">
var a=1;
while(a<=9){
var b=a;
while(b<=9){
if(a*b<10){
document.write(a+'x'+b+'='+a*b+' ');
}else{
document.write(a+'x'+b+'='+a*b+' ');
}
b++;//步长要写在代码块后面
}
document.write('<br>');
a++;//步长要写在代码块后面
}
var n=5,i=0;
while(i<=n){
var j=0;
while(j<=n-i){
document.write(" ");
j++;
}
var k=0;
while(k<=2*i){
document.write("*");
k++;
}
document.write("<br>");
i++;
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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