Login decorator function

def  login_required(view_func):   '''登录判断装饰器'''
    	def wrapper(request, *view_args, **view_kwargs):
            # 判断用户是否登录
        if request.session.has_key('islogin'):
            # 用户已经登录,调用对应的视图
            return view_func(request, *view_args, **view_kwargs)
        else:
            # 用户未登录,跳转到首页
            return redirect('/login')
    return wrapper