function UserLogin()
{
    var username=document.getElementById("Txt_UserName").value;
    var pwd=document.getElementById("Txt_Pwd").value;
    if(username=="")
    {
        alert("用户名不能为空！");
        return;
    }
    if(pwd=="")
	{
       alert("密码不能为空！");
       return;
    }
	$.ajax({
			type:"POST",
			url:'/Ajax/UserLogin.aspx',
			data:"UserName="+username+"&Pwd="+pwd,
			error:function(){alert('error');},
			success:function(msg)
		            { 
		                var v=msg; 
						
			            if (v.indexOf("??")<=-1)
			            {
			                var array=v.split('&');
			                
			                if(array.length>0)
			                {
			                    if(array[0]==1)
			                    {
                                    alert("登陆成功！"); 
                                    document.getElementById("Txt_UserName").value="";
                                    document.getElementById("Txt_Pwd").value="";
                                    getCookie('CheckLogin');
                                }
                                else if(array[0]==2)
                                {
                                    alert("用户名不存在！"); 
                                }
                                else if(array[0]==3)
                                {
                                    alert("密码错误！"); 
                                }
                            }
                            else
                            {
                                alert('发生未知错误，请与管理员联系！');
                            }
	                    }
	                    else
                        {
                            alert('发生未知错误，请与管理员联系！');
                        }
		            }
		});
	
}

function  getCookie(I) //判断是否登陆/退出登陆
{ 
$.ajax({
			type:"POST",
			url:'/Ajax/UserLogin.aspx',
			data:"flag="+I,
			error:function(){alert('error');},
			success:function(msg)
		            {
		                var v=msg; 
			            if (v.indexOf("??")<=-1 && v!="")
			            {
                            document.getElementById("span3").innerHTML=v;
                            document.getElementById("span1").style.display="none";
                            document.getElementById("span2").style.display="";
			            }
			            else
                        {
                            document.getElementById("span1").style.display="";
                            document.getElementById("span2").style.display="none";
                        }
		            }  
		});
	

}

function document.onkeypress()
{
   if(document.getElementById("Txt_UserName").value!="" || document.getElementById("Txt_Pwd").value!="")
   {
       if ( event.keyCode=='13' )
       {
            UserLogin();
       }
   }
}