echarts图防止缩在一个角落,动态控制keep-alive缓存、监听路由跳转

1、父级组件，通过ref调用子组件，activated每次点击页面都会执行

<useele ref="useele" :lineData="lineData" :timenum="timenum" :type="type"></useele>

    activated(){
        if(this.$refs.useele){
            this.$refs.useele.resizeEcharts();
        }
        if(this.$refs.chartsbox){
            this.$refs.chartsbox.resizeEcharts();
        }
    },

2、子组件，让echarts刷新

            resizeEcharts(){
                if (this.myChart != null && this.myChart != "" && this.myChart !=undefined{
                    this.myChart.resize();
                }
            },   

二、动态控制keep-alive缓存

1、在vuex建立数组keepAlive，用于存放需要缓存的组件name

2、App.vue中、引入keepAlive

        <keep-alive :include="keepAlive">
          <router-view></router-view>
        </keep-alive>

  created(){
         this.$router.push({path: '/Main'});
        this.$store.dispatch("changeKeepAlive","Main");
  },

页面标签关闭时，需要剪切掉对应的组件name

//关闭标签的同时，也关闭组件缓存
 this.keepAlive.splice(this.keepAlive.indexOf(val.name), 1);

打开新页面时，监听路由变化

    removalArr(val){
      for(let i = 0;i<this.keepAlive.length;i++){//查找是否有包含的缓存组件
        if(this.keepAlive[i] == val){//如果有,直接return
          return true;
        }
      }
      return false;
    }

  
watch: {
      $route(to,from){
      if(!this.removalArr(to.name) && to.name != "Login"){//如果不存在缓存的组件，并且登录页设置为不缓存
        this.$store.dispatch("changeKeepAlive",to.name);//将此组件添加至缓存中
      }else if(to.name == "Login"){//如果跳转到登录页，需清空所有的缓存
        this.$store.dispatch("changeKeepAlive",[]);//清空
        this.$store.dispatch("changTagArry","");
      }
    }
  },