wepack打包时出错不压缩代码及使用es7（async await）新语法问题

1.打包时出错且不压缩代码是因为没有正确的转换语法

npm install babel-core babel-preset-env babel-loader --save-dev

2.如果使用了async await等es7新语法还要安装

npm install babel-plugin-transform-runtime --save-dev

3.webpack.config.js中配置

module:{
        rules:[
            {
                test:/(\.jsx|.js)$/,
                use:{
                    loader:"babel-loader",
                    options:{
                        presets:["env"]
                    }
                },
                exclude:/node_modules/
            }
        ]
    }

4. .babelrc文件中配置

"plugins":[
        [
        "transform-runtime",
        {
            "helpers": false,
            "polyfill": false,
            "regenerator": true,
            "moduleName": "babel-runtime"
        }
        ]
    ]