JS实用小函数 数据是否合法或存在 获取当前日期时间

1、判断数据是否合法或存在

//判断数据是否合法或存在
function isNotNull(data)
{
  if(data === "" || data === undefined || data === null)  //此处用绝对等于，保证数据类型及数据完全一致。根据需要选为“==”
    return false;
  else
    return true;
}

2、获取当前的日期时间 格式“yyyy-MM-dd HH:MM:SS”

//获取当前的日期时间 格式“yyyy-MM-dd HH:MM:SS”
function getNowFormatDate() {
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
            + " " + date.getHours() + seperator2 + date.getMinutes()
            + seperator2 + date.getSeconds();
    return currentdate;
}

3、计算时间差

function GetDateTimeDiff(startTime, endTime) 
{
    var retValue = {};
    var date = new Date(endTime).getTime() - new Date(startTime).getTime(); //时间差的毫秒数
    //计算出相差天数
    var days = Math.floor(date / (24 * 3600 * 1000));
    retValue.Days = days;
    var years = Math.floor(days / 365);
    retValue.Years = years;
    var months = Math.floor(days / 30);
    retValue.Months = months;
    return retValue;
}

4、数字大写转换

//把数字金额转换成中文大写数字的函数
function changeNumMoneyToChinese(money)
{
    var cnNums = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //汉字的数字
    var cnIntRadice = new Array("", "拾", "佰", "仟"); //基本单位
    var cnIntUnits = new Array("", "万", "亿", "兆"); //对应整数部分扩展单位
    var cnDecUnits = new Array("角", "分", "毫", "厘"); //对应小数部分单位
    var cnInteger = "整"; //整数金额时后面跟的字符
    var cnIntLast = "元"; //整型完以后的单位
    var maxNum = 999999999999999.9999; //最大处理的数字
    var IntegerNum; //金额整数部分
    var DecimalNum; //金额小数部分
    var ChineseStr = ""; //输出的中文金额字符串
    var parts; //分离金额后用的数组，预定义
    if (money == "") {
        return "";
    }
    money = parseFloat(money);
    if (money >= maxNum) {
        alert('超出最大处理数字');
        return "";
    }
    if (money == 0) {
        ChineseStr = cnNums[0] + cnIntLast + cnInteger;
        return ChineseStr;
    }
    money = money.toString(); //转换为字符串
    if (money.indexOf(".") == -1) {
        IntegerNum = money;
        DecimalNum = '';
    } else {
        parts = money.split(".");
        IntegerNum = parts[0];
        DecimalNum = parts[1].substr(0, 4);
    }
    if (parseInt(IntegerNum, 10) > 0) { //获取整型部分转换
        var zeroCount = 0;
        var IntLen = IntegerNum.length;
        for (var i = 0; i < IntLen; i++) {
            var n = IntegerNum.substr(i, 1);
            var p = IntLen - i - 1;
            var q = p / 4;
            var m = p % 4;
            if (n == "0") {
                zeroCount++;
            }
            else {
                if (zeroCount > 0) {
                    ChineseStr += cnNums[0];
                }
                zeroCount = 0; //归零
                ChineseStr += cnNums[parseInt(n)] + cnIntRadice[m];
            }
            if (m == 0 && zeroCount < 4) {
                ChineseStr += cnIntUnits[q];
            }
        }
        ChineseStr += cnIntLast;
        //整型部分处理完毕
    }
    if (DecimalNum != '') { //小数部分
        var decLen = DecimalNum.length;
        for (var i = 0; i < decLen; i++) {
            var n = DecimalNum.substr(i, 1);
            if (n != '0') {
                ChineseStr += cnNums[Number(n)] + cnDecUnits[i];
            }
        }
    }
    if (ChineseStr == '') {
        ChineseStr += cnNums[0] + cnIntLast + cnInteger;
    } else if (DecimalNum == '') {
        ChineseStr += cnInteger;
    }
    return ChineseStr;
}