echart 错误：Error in mounted hook: "Error: Initialize failed: invalid dom."

• 原因：初始化没有获取到元素

• 方法：初始化的时候，使用$nextTick延后执行

    mounted() {
      this.init();
    },
    methods: {
      init() {
        this.$nextTick(() => {
          this.initPic();
        });
      },
  
      initPic() {
        const chartDom = this.$refs.echartPicRef;
        const myChart = echarts.init(chartDom);
        const option = {
          xAxis: {
            type: "category",
            data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
          },
          yAxis: {
            type: "value",
          },
          series: [
            {
              data: [150, 230, 224, 218, 135, 147, 260],
              type: "line",
            },
          ],
        };
  
        option && myChart.setOption(option);
      },
  }