用JS的for循环打印九九乘法表

需要使用两个for循环嵌套，代码如下：

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>九九乘法表</title>
 6 </head>
 7 <body>
 8     <script>
 9     for (var i =1 ; i <= 9; i++) {
10         for(var j=1; j<=i; j++){
11             document.write(i+'x'+j+'='+i*j+',');
12         }
13         document.write('<br/>');
14     }
15     </script>
16 </body>
17 </html>

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