webpack打包去掉开发日志console.log和找到代码异常位置

在webpack.prod.config.js中修改为如下：

new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false,
        drop_debugger: true,
        drop_console: true
      },
      sourceMap: true
    }),

在生产环境下, 因为代码都被编译压缩成一行了, 所以报错都在一行

webpack.config.js: 

var path = require('path');

module.exports = {

    devtool: 'source-map',  // 添加此行

    mode: 'development',

    entry: './client/index.js',

    output: {

        filename: 'bundle.js',

        path: path.resolve(__dirname, 'client')

    }

}