javaScript 将数字保留两位小数并 三分化显示

/保留两位小数并数字三分化
function farmatJine(value) {
    if (value == undefined || value == "") {
        value = 0;
    }
    //现将数字保留两位小数,再将其三分化
    var nStr = (value * 1).toFixed(2);
    nStr += '';
    x = nStr.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
}