原生js获取日期

var formatDate10 = function(date){
    //console.log(date);
    var year = date.getFullYear();
    var month = date.getMonth();
    month = parseInt(month)+1;
    if(month<10){
        month = "0"+month;
    }
    var day = date.getDate();
    if(day<10){
        day = "0"+day;
    }
    return year+"-"+month+"-"+day;
}


var GetEndTime = function () {
    //保障期间--单位天
    this.addmulDate=function(dateParameter, num) {
    var translateDate = "", dateString = "", monthString = "", dayString = "";
    dateParameter = formatDate10(new Date(dateParameter));
    translateDate = dateParameter.replace("-", "/").replace("-", "/");
    var newDate = new Date(translateDate);
    newDate = newDate.valueOf();
    newDate = newDate + (num>0?(num-1):num) * 24 * 60 * 60 * 1000;
    //newDate = newDate + num * 24 * 60 * 60 * 1000;
    newDate  = new Date(newDate);
    //如果月份长度少于2，则前加 0 补位
    if ((newDate.getMonth() + 1).toString().length == 1) {
        monthString = 0 + "" + (newDate.getMonth() + 1).toString();
    } else {
        monthString = (newDate.getMonth() + 1).toString();
    }
    //如果天数长度少于2，则前加 0 补位
    if (newDate.getDate().toString().length == 1) {
        dayString = 0 + "" + newDate.getDate().toString();
    } else {
        dayString = newDate.getDate().toString();
    }
    dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString;
    return dateString;
}
//保障期间--单位月
this.addmulMonth=function (dtstr, n)
{
    var s = dtstr.split("-");
    var yy = parseInt(s[0],10);
    var mm = parseInt(s[1],10) - 1;
    var dd = parseInt(s[2],10);
    var dt = new Date(yy, mm, dd);
    var dateString = "", monthString = "", dayString = "";
    dt.setMonth(dt.getMonth() + n);
    if ((dt.getYear() * 12 + dt.getMonth()) > (yy * 12 + mm + n)) {
        dt = new Date(dt.getYear(), dt.getMonth(), 0);
    }
    //如果月份长度少于2，则前加 0 补位
    if ((dt.getMonth() + 1).toString().length == 1) {
        monthString = 0 + "" + (dt.getMonth() + 1).toString();
    } else {
        monthString = (dt.getMonth() + 1).toString();
    }
    //如果天数长度少于2，则前加 0 补位
    if (dt.getDate().toString().length == 1) {
        dayString = 0 + "" + dt.getDate().toString();
    } else {
        dayString = dt.getDate().toString();
    }
    //return dt.getFullYear() + "-" + monthString + "-" + dayString;
    var yearDay = dt.getFullYear() + "-" + monthString + "-" + dayString;
    return this.addmulDate(yearDay,0);
}
//保障期间--单位年
this.addmulYear=function (dtstr, n)
{
    var s = dtstr.split("-");
    var yy = parseInt(s[0],10);
    var mm = parseInt(s[1],10) - 1;
    var dd = parseInt(s[2],10);
    var dt = new Date(yy, mm, dd);
    var dateString = "", monthString = "", dayString = "";
    dt.setFullYear(dt.getFullYear() + n);
    if ((dt.getYear() * 12 + dt.getMonth()) > (yy * 12 + mm + n)) {

        dt = new Date(dt.getYear(), dt.getMonth(), 0);
    }
    //如果月份长度少于2，则前加 0 补位
    if ((dt.getMonth() + 1).toString().length == 1) {
        monthString = 0 + "" + (dt.getMonth() + 1).toString();
    } else {
        monthString = (dt.getMonth() + 1).toString();
    }
    //如果天数长度少于2，则前加 0 补位
    if (dt.getDate().toString().length == 1) {
        dayString = 0 + "" + dt.getDate().toString();
    } else {
        dayString = dt.getDate().toString();
    }
    //return dt.getFullYear() + "-" + monthString + "-" + dayString;
    var yearDay = dt.getFullYear() + "-" + monthString + "-" + dayString;
    return this.addmulDate(yearDay,0);
}

}
var getEndTime = new GetEndTime()