Background

After introducing the ecarts plug-in into the Vue project, the following errors are found:

[Vue warn]: Error in mounted hook: “TypeError: Cannot read properties of undefined (reading ‘init’)”

The way to import components is: Import on demand

// import echarts
import echarts from 'echarts';
export default {
    name:"",
    mounted() {
        // Initialize echarts instance
        let lineCharts = echarts.init(this.$refs.charts);//On-demand introduction
}

Solution:

Change the introduction method

import * as echarts from 'echarts';