<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="last3Month">12345555554</div>
<br>
<div id="lastMonth"></div>
<br>
<div id="lastWeek"></div>
<script>
window.onload = function(){
var last3Month = document.getElementById(‘last3Month‘).innerHTML;
document.getElementById(‘lastMonth‘).innerHTML = getThousandNum(last3Month);
}
//千分位加逗号
function getThousandNum(val){
var reg = /(?=(?!(\b))(\d{3})+$)/g;
return val.indexOf(‘.‘) >= 0 ? val.split(‘.‘)[0].replace(reg,‘,‘) + ‘.‘ + val.split(‘.‘)[1] : val.replace(reg,‘,‘);
}
</script>
</body>
</html>
其他版本的js实现千分位文章：https://www.cnblogs.com/lvmylife/p/8287247.html
原文：https://www.cnblogs.com/fudanchencds/p/12029935.html