修改echart引入方式

vue.config.js

@@ -0,0 +1,11 @@
+const path = require('path')
+const resolve = dir => {
+  return path.join(__dirname, dir)
+}
+module.exports = {
+  publicPath: './',
+  chainWebpack: config => {
+    config.resolve.alias
+      .set('_c', resolve('src/components')) // key,value自行定义，比如.set('@@', resolve('src/components'))
+  },
+}