使用js让数字的千分位用,分隔,并保留两个小数点

<script>

var data = 42542335434.45334;

//使用正则替换，每隔三个数加一个','
var b = data .toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,');

</script>

（不处理小数点）方法二：

function thousandBitSeparator(num) {
return num && num.toString().replace(/(\d)(?=(\d{3})+\.)/g, function($0, $1) {
return $1 + ",";
});
}
console.log(thousandBitSeparator(123456790.12));

https://www.jianshu.com/p/928c68f92c0c

function numFormat(num){
var res=num.toString().replace(/\d+/, function(n){ // 先提取整数部分
return n.replace(/(\d)(?=(\d{3})+$)/g,function($1){
return $1+",";
});
})
return res;
}

console.log(numFormat(a)); // "1,234,567,894,532"
console.log(numFormat(b)); // "673,439.4542"