路由链接那个被激活就给那个绑定class

<router-link active-class="active" to="/about">About</router-link>
//如果不想使用路由跳转 但只想使用active-class属性，只需要将四个to属性的值设置不同即可
<router-link to="javascript1:;" active-class="tabCurrent">商品介绍</router-link>
<router-link to="javascript2:;" active-class="tabCurrent">商品介绍</router-link>
<router-link to="javascript3:;" active-class="tabCurrent">商品介绍</router-link>
<router-link to="javascript4:;" active-class="tabCurrent">商品介绍</router-link>

动态点击三个a 点那个给那个添加class

<a href="javascript:;" :class="{current:1==current}"  @click="clickMethod1"></a>
clickMethod0 (e) {
      this.current = 0
      this.currentComponent = 'Hot'
    },

遇到watch或者moutend中发起请求顺便赋值来不及的操作，可以使用.then解决，异步操作

watch: {
    a: {
      deep: true,
      handler (newval, oldval) {
        this.$store.dispatch('shoppingCarAbout/getShopCar').then((result) => {
          this.CarLength = this.$store.state.shoppingCarAbout.ShoppingCar.data.length
        })
      }
    }
  },