1.在项目下进入目录：项目包/config/index.js

找到productionSourceMap

     /**
     * Source Maps
     */
    productionSourceMap: true,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',

2.将productionSourceMap的true改为false即可

    productionSourceMap: false,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',

3.打生产包:npm run build

Hash: 450e46e5a578d8ed5832
Version: webpack 3.12.0
Time: 19211ms
                                              Asset       Size  Chunks                    Chunk Names
                static/js/2.f45baf9afd59da355a2c.js    17.9 kB       2  [emitted]
                 static/img/healthIcon2.0a76940.png    21.7 kB          [emitted]
                 static/img/healthIcon1.7f9e278.png      21 kB          [emitted]
                 static/img/healthIcon3.a2530d6.png    20.3 kB          [emitted]
                static/js/0.2623d3f24b6cb900e249.js     182 kB       0  [emitted]
                static/js/1.68a7b37dd5366d3385bc.js    62.6 kB       1  [emitted]
                 static/img/healthIcon4.42cd92c.png    18.9 kB          [emitted]
                static/js/3.dd658b712540b545b1a8.js    6.57 kB       3  [emitted]
           static/js/vendor.ed30b6e3d0cfb8529feb.js     962 kB       4  [emitted]  [big]  vendor
              static/js/app.ab727f325a694968cc20.js    1.22 kB       5  [emitted]         app
         static/js/manifest.bad9ce278a16a20c8817.js    1.48 kB       6  [emitted]         manifest
static/css/app.e93cb55eadaef6e12f4bccfcc6e2e3cc.css    35.6 kB       5  [emitted]         app
                                         index.html  555 bytes          [emitted]

  Build complete.

  Tip: built files are meant to be served over an HTTP server.
  Opening index.html over file:// won't work.

4.打包成功，看项目/dist/static/js/xxxx.js

已经没有各种.map文件，问题解决。

【注】.map文件的作用：

项目打包后，代码都是经过压缩加密的，如果运行时报错，输出的错误信息无法准确得知是哪里的代码报错。有了map就可以像未加密的代码一样，准确的输出是哪一行哪一列有错。