JS 实现给数字加三位一逗号间隔的两种方法

<script  type= "text/javascript">
    var   num_s = "1232134456.546";
    console.log(parseFloat(num_s).toLocaleString());
</script>

<script type="text/javascript">
function format_number(n) {
   var b=parseInt(n).toString();
   var len=b.length;
   if(len<=3){return b;}
   var r=len%3;
   return r>0?b.slice(0,r)+","+b.slice(r,len).match(/\d{3}/g).join(","):b.slice(r,len).match(/\d{3}/g).join(",");
}
var a="53669988.000";
console.log(format_number(a));
console.log(format_number("wahh"));
console.log(format_number(0));
console.log(format_number(6698.0023));
</script>