javascript 日期常用的方法

//yyyy-MM-dd
if (!/^\d{4}\-\d\d?\-\d\d?/.test(datavalue1)) {
alert("datevalue1的日期格式不合法")
}
3:换算星期（摘抄他人）
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class TestDate {
public static String getWeekFromDate(String sDate,int type){
if("".equals(sDate)){
return "";
}
SimpleDateFormat df = null;
if(type==0){
df = new SimpleDateFormat("yyyy-MM-dd");
}else if(type==1){
df = new SimpleDateFormat("yyyyMMdd");
}
Date date = null;
try{
date = df.parse(sDate);
}catch(ParseException e){
e.printStackTrace();
}
Calendar cd = Calendar.getInstance();
cd.setTime(date);
int mydate = cd.get(Calendar.DAY_OF_WEEK);
String showDate = "";
switch (mydate) { //mydate分别是 1---7：星期日，星期一，星期二。。。
case 1:
showDate = "星期日";
break;
case 2:
showDate = "星期一";
break;
case 3:
showDate = "星期二";
break;
case 4:
showDate = "星期三";
break;
case 5:
showDate = "星期四";
break;
case 6:
showDate = "星期五";
break;
default:
showDate = "星期六";
break;
}
return showDate;
}
}