listen for onload events

var scriptEle = document.createElement('script')
scriptEle.onload = function() {
    console.log('')
}
document.body.appendChild(scriptEle)

Thank you for the invitation!

it is recommended to introduce echarts into main.js and register on the prototype of vue !
1, npm install echarts-- save
2, in main.js :

import echarts from 'echarts';
Vue.prototype.$echarts = echarts;

3. You can now get $echarts

A suggestion: generally echarts needs to be initialized before use, so initialization is best done in vue :

mounted() {
    //
    //documentidref
    //ref
    this.obj_echarts = this.$echarts.init(document.getElementById('xxx'));
},
data(){
    return {
        obj_echarts: null
    }
}

I hope my answer will be helpful to you!

Modern browsers are supposed to load js sequentially, so the js in head is bound to load before the js that webpack packages and inserts.

simple code verification is as follows:

  https://webpack.js.org/config.