请实现一个js脚本，要求做到将数字转化为千分位表示如：10000 —-> 10,000
10000121213 —-> 10,000,121,213
今天无意中看到这道题目，想了4种解决方案，和大家分享一下：
//法一function parseNum(num){var list = new String(num).split('').reverse();for(var i = 0; i < list.length; i++){if(i % 4 == 3){list.splice(i, 0, ',');}}return list.reverse().join('');}console.log(parseNum(10000121213));//法二function parseNum(num){var reg=/(?=(?!\b)(\d{3})+$)/g;return String(num).replace(reg, ',');}console.log(parseNum(10000121213));//法三String.prototype.strReverse = function(){return this.split('').reverse().join('');}function parseNum(num){var str_num = String(num);var len = str_num.length;var tail = str_num.slice(0, len % 3);tail = tail.strReverse();var reg=/\d{3}/g;var list = str_num.strReverse().match(reg);list.push(tail);var res = list.join(',').strReverse();return res;}console.log(parseNum(10000121213));//法四function parseNum(num){var list = String(num).split('').reverse();var temp = [];for(var i = 0, len = list.length; i < len; i = i + 3){temp.push(list.slice(i, i + 3).join(''));}return temp.join(',').split('').reverse().join('');}console.log(parseNum(10000121213));
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