在WebPack中使用Async/Await-简单的配置引发错误：未定义RegeneratorRuntime

Question

{
  "name": "vue-wp-simple",
  "description": "A Vue.js project",
  "version": "1.0.0",
  "author": "v",
  "private": true,
  "scripts": {
    "dev": "webpack-dev-server --inline --hot",
    "build": "cross-env NODE_ENV=production webpack --progress --hide-modules"
  },
  "dependencies": {
    "vue": "^2.3.3",
    "vue-router": "^2.7.0",

  },
  "devDependencies": {
    "babel-core": "^6.0.0",
    "babel-loader": "^6.0.0",
    "babel-preset-env": "^1.5.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "cross-env": "^3.0.0",
    "css-loader": "^0.25.0",
    "file-loader": "^0.9.0",
    "style-loader": "^0.18.2",
    "stylus": "^0.54.5",
    "stylus-loader": "^3.0.1",
    "vue-loader": "^12.1.0",
    "vue-template-compiler": "^2.3.3",
    "webpack": "^2.6.1",
    "webpack-dev-server": "^2.4.5"
  }
} 

{
  "presets": [
    ["env", { "modules": false }],
  ]
} 

下面是我如何在组件中使用Async/Await

async mounted(){
            //this.$store.dispatch('loadImg', this.details.imgUrl).then((img) => {
                //this.drawImage(img);    
            //});

            var result = await this.loadImg();
            console.log(result);
        },
        methods:{
            async loadImg(){
                return new Promise((resolve, reject) => {
                    setTimeout(() => {
                        resolve('yeah async await works!');
                    }, 2000);
                });
            }, 
         }

但是当我运行应用程序时，我得到错误：referenceerror：regeneratorRuntime没有定义，甚至组件也没有显示

Answer 1

为了使用await/async，您需要安装几个Babel依赖项。这与Vuejs项目一起工作-

npm install --save-dev babel-polyfill
npm install --save-dev babel-plugin-transform-regenerator

安装后，您需要修改。babelrc文件以使用插件，如下所示-

{
    "plugins": ["transform-regenerator"]
}

和webpack.config.js文件使用再生器，如下所示-

require("babel-polyfill");

module.exports = {
  entry: ["babel-polyfill", "./app.js"]
};