JavaScript-双层for循环打印九九乘法表 

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6     <meta http-equiv="X-UA-Compatible" content="ie=edge">
 7     <title>Document</title>
 8     <script>
 9     var str="";
10     for(var i=1;i<=9;i++){//外层循环控制行数
11         for(var j=1;j<=i;j++){//里层循环控制每一行的个数 j<=i
12             str +=j +'x'+i+'='+i * j+'\t';
13         }
14         str=str+ '\n';
15     }
16     console.log(str);
17     </script>
18 </head>
19 <body>
20 </body>
21 </html>

 

posted @ 2019-12-09 16:29  行路途者  阅读(657)  评论(0)    收藏  举报