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调用init方法语句写在this.$nextTick(() => {});方法里，因为nextTick方法在页面元素加载完之后调用

this.$nextTick(() => {this.$refs.chartComponent.init();});

如果还报错：Error in nextTick: "TypeError: Cannot read properties of undefined (reading ‘init’)"和Cannot read properties of undefined (reading ‘init’)，则先判断组件是否存在，再调用该方法，问题解决。

if (this.$refs.chartComponent) {this.$nextTick(() => {this.$refs.chartComponent.init();});
}