js 日期加减

来源：互联网发布：模仿优化编辑：程序博客网时间：2024/06/08 10:05
    Date.prototype.add = Date.prototype.add || function (date,time) {        var _time = time.split(' ');        var num = parseInt(_time[0]);        var type = _time[1];        var result = null;        switch (type){            case 'year':                result = new Date(date.getFullYear()+num,date.getMonth(),date.getDate(),date.getHours(),date.getMinutes(),date.getSeconds());                break;            case 'month':                result = new Date(date.getFullYear(),date.getMonth()+num,date.getDate(),date.getHours(),date.getMinutes(),date.getSeconds());                break;            case 'week':                result = new Date(date.getTime()+(1000 * 60 * 60 * 24 * 7 * num));                break;            case 'day':                result = new Date(date.getTime()+(1000 * 60 * 60 * 24 * num));                break;            case 'hours':                result = new Date(date.getTime()+(1000 * 60 * 60 * num));                break;            case 'minute':                result = new Date(date.getTime()+(1000 * 60 * num));                break;            case 'second':                result = new Date(date.getTime()+(1000 * num));                break;        }        return {            year:result.getFullYear(),            month:result.getMonth()+1,            day:result.getDate(),            hour:result.getHours(),            minute:result.getMinutes(),            second:result.getSeconds()        };    };    //测试数据    var date = new Date();    var year = date.getFullYear();    var month = date.getMonth()+1;    var day = date.getDate();    /*        单位 hours minute second day week month year    */    console.log(date.add(date,'+1 day'));    console.log('now is',year,month,day);
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