扩展javascript的Date方法实现代码(prototype)

//将指定的毫秒数加到此实例的值上
Date.prototype.addMilliseconds = function (value) {
var millisecond = this.getMilliseconds();
this.setMilliseconds(millisecond + value);
return this;
};
//将指定的秒数加到此实例的值上
Date.prototype.addSeconds = function (value) {
var second = this.getSeconds();
this.setSeconds(second + value);
return this;
};
//将指定的分钟数加到此实例的值上
Date.prototype.addMinutes = function (value) {
var minute = this.addMinutes();
this.setMinutes(minute + value);
return this;
};
//将指定的小时数加到此实例的值上
Date.prototype.addHours = function (value) {
var hour = this.getHours();
this.setHours(hour + value);
return this;
};
//将指定的天数加到此实例的值上
Date.prototype.addDays = function (value) {
var date = this.getDate();
this.setDate(date + value);
return this;
};
//将指定的星期数加到此实例的值上
Date.prototype.addWeeks = function (value) {
return this.addDays(value * 7);
};
//将指定的月份数加到此实例的值上
Date.prototype.addMonths = function (value) {
var month = this.getMonth();
this.setMonth(month + value);
return this;
};
//将指定的年份数加到此实例的值上
Date.prototype.addYears = function (value) {
var year = this.getFullYear();
this.setFullYear(year + value);
return this;
};
//格式化日期显示 format="yyyy-MM-dd hh:mm:ss";
Date.prototype.format = function (format) {
var o = {
"M+": this.getMonth() + 1, //month
"d+": this.getDate(), //day
"h+": this.getHours(), //hour
"m+": this.getMinutes(), //minute
"s+": this.getSeconds(), //second
"q+": Math.floor((this.getMonth() + 3) / 3), //quarter
"S": this.getMilliseconds() //millisecond
}
if (/(y+)/.test(format)) {
format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
for (var k in o) {
if (new RegExp("(" + k + ")").test(format)) {
format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
}
}
return format;
}

var date = new Date();
date.addHours(1);
date.addYears(2);
document.write(date.format('yyyy-MM-dd hh:mm:ss'));