vue 退出登录

1.退出登陆  规定从 'login'跳转过来的就当前页面重新获取购物车数量

    logout () {
      this.axios.post('/user/logout').then(() => {
        this.$message.success('退出成功')
        this.$cookies.set('userId', '', '-1')
        this.$store.dispatch('saveUserName', '')
        this.$store.dispatch('saveCartCount', '0')
      })
    }

  mounted () {
    this.getProductList()
    // router 路由   route当前路由的实例
    const params = this.$route.params
    if (params && params.from === 'login') {
      this.getCartCount()
    }
  }

2.在登录页面‘login’   login.vue   将cookie 设置为session级别的   关闭浏览器cookie消失

    login () {
      const { username, password } = this
      if (!username || !password) {
        this.$message.error('请输入正确的用户名和密码')
        return
      }
      this.axios.post('/user/login', {
        username,
        password
      }).then((res) => {
        this.$cookies.set('userId', res.id, 'Session')
        this.$store.dispatch('saveUserName', res.username)
//指定跳转
        this.$router.push({
          name: 'index',
          params: {
            from: 'login'
          }
        })
    
    },
     getCartCount () {
      this.axios.get('/carts/products/sum').then((res = 0) => {
        // to-do 保存到vuex里面
        this.$store.dispatch('saveCartCount', res)
      })
    }

------------------

在app.vue中判断是否登录  获取用户信息和购物车数据

  mounted () {
    const isCookie = this.$cookies.get('userId')
    if (isCookie) {
      this.getUser()
      this.getCartCount()
    }
  }

---------------------

如果在主页面有添加购物车的功能则要

    addCart (id) {
      const isCookie = this.$cookies.get('userId')
      if (!isCookie) {
        this.$message.warning('你还没有登录')
        setTimeout(() => {
          window.location.href = '/#/login'
        }, 2000)
        return
      }
      this.axios.post('/carts', {
        productId: id,
        selected: true
      }).then((res) => {
        this.showModal = true
        this.$store.dispatch('saveCartCount', res.cartTotalQuantity)
      }).catch(() => {
        this.showModal = true
      })
    }