JavaScript处理数字分位符号

addCommas.js

//数组方式处理 小数位有空格隔开
function addCommas(val) {
    var aIntNum = val.toString().split(".");
    if (aIntNum[0].length >= 5) {
        aIntNum[0] = aIntNum[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
    }
    if (aIntNum[1] && aIntNum[1] >= 5) {
        aIntNum[1] = aIntNum[1] ? aIntNum[1].replace(/\B(?=(\d{3})+(?!\d))/g, " ") : " ";
    }
    return aIntNum.join(".");
}

//字符串方式处理一
function addCommas(val) {
    var sIntNum = val.toString(),
        bIndex = sIntNum.indexOf('.');
    return sIntNum.replace(/\d(?=(?:\d{3})+(?:\.|$))/g, function($0, i) {
        return bIndex < 0 || i < bIndex ? ($0 + ',') : $0;
    });
}

//字符串方式处理二
function addCommas(val) {
    return (val + "").replace(/\b(\d+)((\.\d+)*)\b/g, function(a, b, c) {
        return (b.charAt(0) > 0 && !(c || ".").lastIndexOf(".") ? b.replace(/(\d)(?=(\d{3})+$)/g, "$1,") : b) + c;
    });
}