login(){
     if(!this.username||!this.password){
      this.errMsg="请输入用户名与密码！";
      this.errShow=true;
     }else{
      axios.post('/users/login',{
       username:this.username,
       password:this.password
      }).then((response,err)=>{
       let res=response.data;
       if(res.status===0){
        this.hasLogin=true;
        this.nickname=res.result;
        this.closeLogin();
       }else{
        this.errShow=true;
        this.errMsg=res.msg;
       }
      })
     }
    },

router.post('/login', function(req, res, next) {
 let username=req.body.username;
 let password=req.body.password;
 let params={
  userName:username,
  userPwd:password
 };
 user.findOne(params,(err,userDoc)=>{
  "use strict";
  if(err){
   res.json({
    status:1,
    msg:err.message
   })
  }else {
   if(userDoc){
    //登陆成功后设置res.cookie与req.session
    res.cookie('userId',userDoc.userId,{
     maxAge:1000*60*60
    });
    res.cookie('userName',userDoc.userName,{
     maxAge:1000*60*60
    });
    res.json({
     status:0,
     msg:'登陆成功',
     result:userDoc.userName
    });
   }else{
    res.json({
     status:1,
     msg:'用户名或密码错误！'
    });
   }
  }
 })
});

//全局拦截
app.use(function (req,res,next) {
 if(req.cookies.userId) next();    //已登陆
 //未登录，只能访问登录与商品页面
 else if(req.originalUrl==='/users/login'||req.originalUrl.indexOf('/goods')>-1) next();
 else{
  res.json({
   status:3,
   msg:'用户未登录'
  })
 }
});

//路由跳转
app.use('/', index);
app.use('/users', users);
app.use('/goods', goods);

router.get('/checkLogin',(req,res)=>{
 "use strict";
 if(req.cookies.userId){      //设置了cookie，用户已登陆
  res.json({
   status:0,
   msg:"登录成功",
   username:req.cookies.userName
  })
 }else {
  res.json({
   status:3,
   msg: "未登录"
  })
 }
});

router.get('/logout',(req,res)=>{
 "use strict";
 res.cookie('userId','',{maxAge:0});
 res.cookie('userName','',{maxAge:0});
 res.json({
  status:0,
  msg:'登出成功！'
 })
});