//重写toString方法，将时间转换为Y-m-d H:i:s格式Date.prototype.toString = function(){	return this.getFullYear() + "-" + (this.getMonth()+1) + "-" + this.getDate() + " " + this.getHours() + ":" + this.getMinutes() + ":" + this.getSeconds();	}//格式化时间字符串Date.prototype.toFormatString = function(format){	if(format == ""){		return this.toString();		}	var str = ‘‘;	str = format.replace(/Y|y/,this.getFullYear())				.replace(/M|m/,this.getMonth() + 1)				.replace(/D|d/,this.getDate())				.replace(/H|h/,this.getHours())				.replace(/I|i/,this.getMinutes())				.replace(/S|s/,this.getSeconds());	return str;				}//在当前时间上添加年数Date.prototype.addYear = function(years){	var cyear = this.getFullYear();	cyear += years;	this.setYear(cyear);	return this;	}//在当前时间上添加天数Date.prototype.addDay = function(days){	var cd = this.getDate();	cd += days;	this.setDate(cd);	return this;}//在当前时间上添加月数Date.prototype.addMonth = function(months){	var cm = this.getMonth();	cm += months;	this.setMonth(cm);		return this;}//将php时间格式(Y-m-d H:i:s)转化为js日期对象function phpDateToJsDate(phpDate){	if(phpDate == ""){		return new Date();		}	return new Date(Date.parse(phpDate.replace(/-/g,"/")));}