js如何把"2006-01-01"格式转为日期格式，并比较大小
js如何把 "2006-01-01 "格式转为日期格式，并比较大小

[解决办法]
s1=document.getElementById( "txtstart ").value.replace(/\-/g, "/ ") ;
var n1=new Date(s1);
s2=el( "txtend ").value.replace(/\-/g, "/ ") ;
var n2=new Date(s2);
if(n2 <n1)
{
alert( "结束日期不能小于开始日期 ");
return ;
}
[解决办法]
/*用相对不规则的字符串来创建日期对象,不规则的含义为:顺序包含年月日三个数值串,有间隔*/
String.prototype.createDate = function(){
var reg = /^\D*(\d{2,4})\D+(\d{1,2})\D+(\d{1,2})\D*$/;
var str = this.replace(/\s/g, " ");
str = str.replace(reg, "$1/$2/$3 ");
var date = new Date(str);
if(isNaN(date)) return new Date();
else return date;
}

/*
* 功能:根据输入表达式返回日期字符串
* 参数:dateFmt:字符串,由以下结构组成
* yy:长写年,YY:短写年mm:数字月,MM:英文月,dd:日,hh:时,
* mi:分,ss秒,ms:毫秒,we:汉字星期,WE:英文星期.
* isFmtWithZero : 是否用0进行格式化,true or false
*/
Date.prototype.parseString = function(dateFmt,isFmtWithZero){
dateFmt = (dateFmt == null? "yy-mm-dd " : dateFmt);
isFmtWithZero = (isFmtWithZero == null?true : isFmtWithZero);
if(typeof(dateFmt) != "string " )
throw (new Error(-1, 'parseString()方法需要字符串类型参数! '));
var weekArr=[[ "星期日 ", "星期一 ", "星期二 ", "星期三 ", "星期四 ", "星期五 ", "星期六 "],
[ "SUN ", "MON ", "TUR ", "WED ", "THU ", "FRI ", "SAT "]];
var monthArr=[ "JAN ", "FEB ", "MAR ", "APR ", "MAY ", "JUN ", "JUL ", "AUG ", "SEP ", "OCT ", "NOV ", "DEC "];
var str=dateFmt;
str = str.replace(/yy/g,this.getFullYear());
str = str.replace(/YY/g,this.getYear());
str = str.replace(/mm/g,(this.getMonth()+1).toString().fmtWithZero(isFmtWithZero));
str = str.replace(/MM/g,monthArr[this.getMonth()]);
str = str.replace(/dd/g,this.getDate().toString().fmtWithZero(isFmtWithZero));
str = str.replace(/hh/g,this.getHours().toString().fmtWithZero(isFmtWithZero));
str = str.replace(/mi/g,this.getMinutes().toString().fmtWithZero(isFmtWithZero));
str = str.replace(/ss/g,this.getSeconds().toString().fmtWithZero(isFmtWithZero));
str = str.replace(/ms/g,this.getMilliseconds().toString().fmtWithZeroD(isFmtWithZero));
str = str.replace(/we/g,weekArr[0][this.getDay()]);
str = str.replace(/WE/g,weekArr[1][this.getDay()]);
return str;
}
/*将一位数字格式化成两位,如: 9 to 09*/
String.prototype.fmtWithZero = function(isFmtWithZero){
if(isFmtWithZero)
return (this <10? "0 "+this:this);
else return this;
}
String.prototype.fmtWithZeroD = function(isFmtWithZero){
if(isFmtWithZero)
return (this <10? "00 "+this:(this <100? "0 "+this:this));
else return this;
}

/* 功能 : 返回与某日期相距N天(N个24小时)的日期
* 参数 : num number类型 可以为正负整数或者浮点数,默认为1;
* type 0(秒) or 1(天),默认为秒
* 返回 : 新的PowerDate类型
*/
Date.prototype.dateAfter=function(num,type){
num = (num == null?1:num);

if(typeof(num)!= "number ") throw new Error(-1, "dateAfterDays(num,type)的num参数为数值类型. ");
type = (type==null?0:type);
var arr = [1000,86400000];
var dd = this.valueOf();
dd += num*arr[type];
return new Date(dd);
}

//判断是否是闰年,返回true 或者 false
Date.prototype.isLeapYear = function (){
var year = this.getFullYear();
return (0==year%4 && ((year % 100 != 0)||(year % 400 == 0)));
}

//返回该月天数
Date.prototype.getDaysOfMonth = function (){
return (new Date(this.getFullYear(),this.getMonth()+1,0)).getDate();
}

//转换成大写日期(中文)
Date.prototype.getChinaDate = function(){
var year = this.getFullYear().toString();
var month= this.getMonth()+1;
var day = this.getDate();
var arrNum = [ "零 ", "一 ", "二 ", "三 ", "四 ", "五 ", "六 ", "七 ", "八 ", "九 ", "十 ", "十一 ", "十二 "];
var strTmp= " ";
for(var i=0,j=year.length;i <j;i++){
strTmp += arrNum[year.charAt(i)];
}
strTmp += "年 ";
strTmp += arrNum[month]+ "月 ";
if(day <10)
strTmp += arrNum[day];
else if (day <20)
strTmp += "十 "+arrNum[day-10];
else if (day <30 )
strTmp += "二十 "+arrNum[day-20];
else
strTmp += "三十 "+arrNum[day-30];
strTmp += "日 ";
return strTmp;
}
//日期比较函数,参数date:为Date类型,如this日期晚于参数:1,相等:0 早于: -1
Date.prototype.dateCompare = function(date){
if(typeof(date) != "object " || !(/Date/.test(date.constructor)))
throw new Error(-1, "dateCompare(date)的date参数为Date类型. ");
var d = this.getTime() - date.getTime();
return d> 0?1:(d==0?0:-1);
}

/*功能:返回两日期之差
*参数:date 一个Date对象
* type: 返回类别标识.yy:年,mm:月,ww:周,dd:日,hh:小时,mi:分,ss:秒,ms:毫秒
* intOrFloat :返回整型还是浮点型值 0:整型,不等于0:浮点型
* output : 输出提示,如:时间差为#周!
*/
Date.prototype.calDateDistance = function (date,type,intOrFloat,output){
if(typeof(date) != "object " || !(/Date/.test(date.constructor)))
throw new Error(-1, "calDateDistance(date,type,intOrFloat)的date参数为Date类型. ");
type = (type==null? 'dd ':type);
if(!((new RegExp(type+ ", ", "g ")).test( "yy,mm,ww,dd,hh,mi,ss,ms, ")))
throw new Error(-1, "calDateDistance(pd,type,intOrFloat,output)的type参数为非法. ");
var iof = (intOrFloat==null?0:intOrFloat);
var miSecMain = this.valueOf();
var miSecSub = date.valueOf();
var num=0;
switch(type){
case "yy ": num = this.getFullYear() - pd.getFullYear(); break;
case "mm ": num = (this.getFullYear() - pd.getFullYear())*12+this.getMonth()-pd.getMonth(); break;
case "ww ": num = ((miSecMain-miSecSub)/7/86400000).fmtRtnVal(iof); break;
case "dd ": num = ((miSecMain-miSecSub)/86400000).fmtRtnVal(iof); break;
case "hh ": num = ((miSecMain-miSecSub)/3600000).fmtRtnVal(iof); break;
case "mi ": num = ((miSecMain-miSecSub)/60000).fmtRtnVal(iof); break;

case "ss ": num = ((miSecMain-miSecSub)/1000).fmtRtnVal(iof); break;
case "ms ": num = (miSecMain-miSecSub);break;
default: break;
}
if(output)
return output.replace(/#/g,num);
else return num;
}
//返回整数或者两位小数的浮点数
Number.prototype.fmtRtnVal = function (intOrFloat){
return (intOrFloat == 0 ? Math.floor(this) : parseInt(this*100)/100);
}

// var date = "2004-05-25 ".createDate();
// alert(date.parseString( "yy-YY-mm-MM-dd hh:mi:ss.ms WE we ",true));
// alert(date.calDateDistance(new Date(), "dd ",1, "相差#天! "));

[解决办法]
我试了试一楼的没通过
二楼的有太多了
我是这样转换的
var str_Date = document.getElementById( "tbx_date ").value.split( "- ");
var date = new Date(str_Date[0],str_Date[1],str_Date[2]);
前提条件输入日期格式为YYYY-MM-DD楼主可以用正则验证
Date(年，月，日);