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; } });