javascript日期加减——年、月、日

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javascript日期加减——年、月、日

javascript的日期加减，能够进行日期的加减（月份只能加，不能减），下面是代码和截图：

<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title></title>    <script src="test.js"></script></head><body>    <h1>hello world</h1></body></html>

/** * Created by Administrator on 2016-08-31. */window.onload = function () {    var nowdate = new Date();    console.log(dateToString(nowdate));    console.log(dateToString(dateAddDate(nowdate, 2)));    console.log(dateToString(dateAddMonth(nowdate,12)));    var testdate = '2016-8-30';    var temptestdate = dateAddMonth(testdate, -6);    console.log(dateToString(temptestdate));    console.log(dateToString(dateAddYear(temptestdate, 1)));};/** * 日期转换成 2016-8-31形式 * @param date * @returns {string} */var dateToString = function (date) {    return date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate();};/** * 日期加上任意天数或减去任意天数 * @param date * @param dayCount * @returns {Date} */var dateAddDate = function (date, dayCount) {    var tempDate = dateToDate(date);    var count = parseInt(dayCount);    var oldYear = tempDate.getFullYear();    var oldMonth = tempDate.getMonth();    var oldDate = tempDate.getDate();    var newDate = oldDate + count;    return new Date(oldYear, oldMonth, newDate);};/** * 把字符串转换成Date，如果是Date类型，则不转换。2016-8-31 * @param date * @returns {Date} */function dateToDate(date) {    var sDate = new Date();    if (typeof date == 'object' && typeof new Date().getMonth == "function") {        sDate = date;    } else if (typeof date == "string") {        var arr = date.split('-');        if (arr.length == 3) {            sDate = new Date(arr[0] + '-' + arr[1] + '-' + arr[2]);        }    }    return sDate;};/** * 日期加上任意月份 * @param date * @param monthCount * @returns {Date} */var dateAddMonth = function (date, monthCount) {    var tempDate = dateToDate(date);    var count = parseInt(monthCount);    if(count < 0){        return new Date();    }    var oldYear = tempDate.getFullYear();    var oldMonth = tempDate.getMonth();    var oldDate = tempDate.getDate();    var newMonth = oldMonth + count;    var newDate = new Date(oldYear, newMonth, oldDate);    //防止月份数不一致，进行微调    while (newDate.getMonth() != (newMonth % 12)) {        oldDate--;        newDate = new Date(oldYear, newMonth, oldDate);    }    return newDate;};/** * 日期加减年 * @param date * @param yearCount * @returns {Date} */var dateAddYear = function (date, yearCount) {    var tempDate = dateToDate(date);    var count = parseInt(yearCount);    var oldYear = tempDate.getFullYear();    var oldMonth = tempDate.getMonth();    var oldDate = tempDate.getDate();    var newYear = oldYear + count;    var newDate = new Date(newYear, oldMonth, oldDate);    //防止月份数不一致，进行微调    while (newDate.getMonth() != oldMonth) {        oldDate--;        newDate = new Date(newYear, oldMonth, oldDate);    }    return newDate;};

运行结果：

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