javascript Date 类型扩展支持按年、月、日、小时等加减

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// Date 类型扩展
$.extend(Date.prototype, {
    addTimeSpan: function(unit, n) {
        var newDate = new Date(this);
        newDate‘set’ + unit + n);
        return newDate;
    },

    addYears: function(years) {
        return this.addTimeSpan(‘FullYear’, years);
    },

    addMonths: function(months) {
        return this.addTimeSpan(‘Month’, months);
    },

    addDays: function(days) {
        return this.addTimeSpan(‘Date’, days);
    },

    addHours: function(hours) {
        return this.addTimeSpan(‘Hours’, hours);
    },

    addMinutes: function(minutes) {
        return this.addTimeSpan(‘Minutes’, minutes);
    },

    addSeconds: function(seconds) {
        return this.addTimeSpan(‘Seconds’, seconds);
    },

    addMilliSeconds: function(milliSeconds) {
        return this.addTimeSpan(‘MilliSeconds’, milliSeconds);
    }
});

Date.now = function() {
    return new Date();
}
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