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通过正则高效实现千位符（一行代码你敢信？）
source link: https://juejin.im/post/5b766e7e6fb9a009b368bf37
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怎么实现千位符 将数字转为可读性比较高的具有千位符是笔试/面试经常被问到的，实现方案也有很多种。 一般情况下，按照我们普通的想法，就是将数字转为字符串，然后使用字符串的substr、slice、substring来实现，从右到左，每隔三位插入一个","，eg：
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