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59 lines
1.5 KiB
59 lines
1.5 KiB
1 year ago
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Date.prototype.addMonth = function(addMonth) {
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var y = this.getFullYear();
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var m = this.getMonth();
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var nextY = y;
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var nextM = m;
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//如果当前月+增加的月>11 这里之所以用11是因为 js的月份从0开始
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if (m + addMonth > 11) {
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nextY = y + 1;
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nextM = parseInt(m + addMonth) - 12;
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} else {
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nextM = this.getMonth() + addMonth;
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}
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var daysInNextMonth = Date.daysInMonth(nextY, nextM);
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var day = this.getDate();
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if (day > daysInNextMonth) {
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day = daysInNextMonth;
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}
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return new Date(nextY, nextM, day);
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};
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//计算当前月最大天数
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Date.daysInMonth = function(year, month) {
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if (month == 1) {
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if (year % 4 == 0 && year % 100 != 0) return 29;
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else return 28;
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} else if ((month <= 6 && month % 2 == 0) || (month > 6 && month % 2 == 1))
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return 31;
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else return 30;
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};
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Date.prototype.format = function(format) {
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var date = {
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"M+": this.getMonth() + 1,
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"d+": this.getDate(),
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"h+": this.getHours(),
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"m+": this.getMinutes(),
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"s+": this.getSeconds(),
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"q+": Math.floor((this.getMonth() + 3) / 3),
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"S+": this.getMilliseconds()
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};
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if (/(y+)/i.test(format)) {
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format = format.replace(
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RegExp.$1,
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(this.getFullYear() + "").substr(4 - RegExp.$1.length)
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);
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}
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for (var k in date) {
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if (new RegExp("(" + k + ")").test(format)) {
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format = format.replace(
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RegExp.$1,
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RegExp.$1.length == 1
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? date[k]
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: ("00" + date[k]).substr(("" + date[k]).length)
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);
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}
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}
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return format;
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};
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