2、系统登陆

def do_login(request):
    if request.method == 'POST':
        name = request.POST.get("user_name")
        pwd = request.POST.get("user_pwd")
        try :
            infos = UserBase.objects.filter(user_name = name,user_pwd = pwd)[0]
        except:
            return HttpResponse("x")
        #all of pass , jump to user_center
        else:
            infos.login_num = infos.login_num+1
            infos.login_time = datetime.datetime.now()
            infos.save()
            #user_state save info.
            user_state = UserState()
            try:
                UserState.objects.get(user_id = infos.id).delete()
            except:
                #return login(request)
                pass
            else:
                user_state.session_key = request.session.session_key
                user_state.user_id = infos.id
                user_state.in_time = datetime.datetime.now()
                user_state.ip = request.META['REMOTE_ADDR']
                user_state.save()
            
            request.session['user_info'] = infos
            return HttpResponse("ok")

前台采用的是js提交，不用表单提交的原因很多。这里记录下javascript键盘enter事件的处理：
用了jq，因为之前网上找的代码都不能完成兼容。后来在翻jqAPI文档的时候发现还有keydown的这个事件。测试了 ie ff 谷歌都没问题。

$(document).keydown(function(event){ 
			if(event.keyCode == 13){ 
				if($("#user_name").val()!==""){
				$.post("/do_login/",{"user_name":$("#user_name").val(),"user_pwd":$("#user_pwd").val()},function(msg){
					if(msg=="ok"){
						window.location="/xxxxx/";
					}else if(msg=="namex"){
						alert("没有该用户名！");
					}else if(msg=="x"){
						alert("用户名密码错误！");
					}
				});
			}				
			return false; 
		} 
});