开发者学堂课程【JavaScript 入门与实战：For 循环乘法表】学习笔记，与课程紧密联系，让用户快速学习知识。
课程地址：https://developer.aliyun.com/learning/course/582/detail/8030
For 循环乘法表
//打印 9*9 乘法表
var str = “";
for(var i=1;i<=9;i++){
for(var j=i; j<=9;j++){
str = i+’*‘+j+’=+(i*j)+‘\t';
}
str +=‘\n’;
}
1 * 1= 1 1 * 2=2 1 * 3.3 1= 4 =4 1 .5 =5 1* 6=6 1* 7=7 1 * 8=8 1* 9 = 9
2 * 2= 4 2 * 3 = 6 2 * 4 =8 2 * 5 = 10 2*6 = 12 2* 7= 14 2 * 8 = 16 2* 9 =18
3 * 3=9 3 * 4 = 12 3 * 5 = 15 3 *6 = 18 3 * 7= 21 3 * 8= 24 3 * 9= 27
4 * 4 = 16 4* 5 = 20 4 * 6= 24 4* 7 = 28 4* 8= 32 4* 9 = 36
5 * 5 = 25 5* 6= 30 5 * 7= 35 5 * 8 = 40 5* 9 = 45
6* 6 = 36 6 7 = 42 6* 8 = 48 6* 9 = 54
7*7 = 49 7* 8 = 56 7 * 9 = 63
8* 8=64 8* 9 =72
9*9 =81
