方法1

app.js

App({
    require: function($uri){return require($uri)},
    onLaunch: function () {
    },
)}

page.js

const app = getApp();
const echarts = app.require('/ec-canvas/echarts')
Page({
    data:{
    },
    onLoad: function (options) {
    },
)}

方法2

app.json

{
    "resolveAlias":{
        "~/*": "/*"
    },
    "pages": [
        "pages/index/index"
    ],
}

index.js

import * as echarts from '~/ec-canvas/echarts';
Page({
    data:{
    },
    onLoad: function (options) {
    },
)}