JS去除千分位

//去除千分位不保留
function delcommafy(num) {
    if (num == "") {
        return 0;
    }
    if (!isNaN(num))
        return num;
    var x = num.split(',');
    var result = parseFloat(x.join(""));
    return result;
}
delcommafy(5200,5555)
//5200

//去除千分位
var total="5200,5555";
total = Number(total.replace(/[,]/g,""))
//52005555