Echarts 自适应

    initChart() {
      this.resizeObserver = new ResizeObserver(entries => {
        this.handleResize(entries[0].contentRect);
      });

      this.$once('hook:beforeDestroy', () => {
        this.resizeObserver.disconnect();
      });

      this.resizeObserver.observe(this.$refs[`refName`][0].$el);
    }