登录后跳转回上一个要访问的页面

　　　　　　　　　　var prevurl = document.referrer;
                            var page = prevurl.split('.html');
                            var num = page[0].lastIndexOf('/');
                            var tag= page[0].substring(num+1);
                            if(tag == 'choose'){   //如果上一个页面名称为choose.html,则跳转回去
                                window.location.href="/wzf/Form/choose.html";
                            }else{
                                window.location.href="/wzf/Index/index.html";
                            }