Error in nextTick: “TypeError: Cannot read properties of undefined (reading ‘getAttribute’)” 问题的解决

Error in nextTick: “TypeError: Cannot read properties of undefined (reading ‘getAttribute’)” 问题的解决

报错 Cannot read properties of undefined
解决方法：加一个判断if (表示dom已存在)，再执行this.nextTick() 方法

if (this.$refs.chart) {
      this.$nextTick(() => {
          let chart3 = this.$refs.chart3;
          vm.myChart3 = this.$echarts.init(chart3);
          vm.myChart3.setOption(option, true);
      });
  }

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