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思考：
在学习了流程控制和条件判断后，我们可以利用js打印各式各样的九九乘法表
不管是打印什么样三角形九九乘法表，我们都应该找到有规律的地方，比如第一列的数字是什么规律，第一行的数字是什么规律，只要找到了共性，九九乘法表就很简单了。
注意点：
怎么控制换行？
console.log()默认就是打印一次换一行，我们这时候就需要把一行的乘法数字都通过字符串拼接在一起，等这一行结束后，就在外层for循环里打印，而不是在内层的循环。
怎么实现每两个数相乘后的间隔？
使用转义字符 \t ，相当于tab键
对于那些前面空的我们怎么处理？
其实用的就是空格，因为空格也是有规律的，也要额外用循环遍历打印，大概两个\t等价于(ij=ij)。
我们在测试的时候，可以用一些比较显眼的字符代替，比如&#都可以，等效果出来了再改成空格。
<body> <script> //九九乘法表 for (var i = 1; i <= 9; i++) { var s = ''; for (var j =
1; j <= i; j++) { s += j + '*' + i + '=' + (i * j) + '\t' } console.log(s); }
console.log(
"===================================================================") for (var
i= 1; i <= 9; i++) { var t = ''; for (var j = i; j <= 9; j++) { t += i + '*' + j
+ '=' + (i * j) + '\t' } console.log(t); } console.log(
"===================================================================") for (var
i= 1; i <= 9; i++) { var u = ''; for (var k = 1; k < i; k++) { u += "\t\t" } for
(var j = i; j <= 9; j++) { u += i + '*' + j + '=' + (i * j) + '\t' } console.log
(u); } </script> </body>
