//校验用户名：只能输入3-20个字母、数字、下划线   
function isLoginName(s) 
{ 
    var patrn=/^([0-9]|[a-z]|[A-Z]|[_]){3,20}$/; 
    if (!patrn.exec(s)) 
    {
        return false 
    }
    else
    {
        return true 
    }
}
//校验密码：只能输入4-20个字母、数字、下划线   
function isLoginPass(s) 
{ 
    var patrn=/^([0-9]|[a-z]|[A-Z]|[_]){4,20}$/; 
    if (!patrn.exec(s)) 
    {
        return false 
    }
    else
    {
        return true 
    }
}

//校验Email 
function isEmail(s) 
{ 
    var patrn=/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;
    if (!patrn.exec(s)) 
    {
        return false 
    }
    else
    {
        return true 
    }
}

//校验手机  
function isMobile(s) 
{ 
    var patrn=/^((\(\d{3}\))|(\d{3}\-))?13\d{9}$/; 
    if (!patrn.exec(s)) 
    {
        return false 
    }
    else
    {
        return true 
    }
}
 
//校验邮编
function isZipCode(s)
{
    var patrn=/^[0-9]{6}$/;
    if (!patrn.exec(s)) 
    {
        return false 
    }
    else
    {
        return true 
    } 
}
 
//获取系统时间
function now()
{
    var today = new Date(); 
    var hour = today.getHours(); 
    var year =today.getFullYear();
    var month =today.getMonth() +1;
    var day =today.getDate();
    var week;
    hour =(hour <10)?"0"+ hour:hour;  
    month =(month <10)?"0"+ month:month;
    day =(day <10)?"0"+ day:day;
    
     if(today.getDay()==0)                     week   =   "星期日"                                                       
        else   if(today.getDay()==1)           week   =   "星期一"                                                       
        else   if(today.getDay()==2)           week   =   "星期二"                                                       
        else   if(today.getDay()==3)           week   =   "星期三"                                                       
        else   if(today.getDay()==4)           week   =   "星期四"                                                       
        else   if(today.getDay()==5)           week   =   "星期五"                                                       
        else   if(today.getDay()==6)           week   =   "星期六";  
    
    document.write(year +"年"+ month +"月"+ day +"日 "   + week );
}