path模块我们之前提到过，这里就不细说。我们可以来分析一下config目录下的index.js文件。
index.js
这个文件中，其实有十分充足的代码注释，我们也可以来深入探究一下。
从代码中，我们可以看到通过module.exports导出了一个对象，其中包含两个设置dev和build。
在dev中，设置了一些配置，代码如下：
modules.exports = {
dev: {
// Paths
assetsSubDirectory: 'static',
assetsPublicPath: '/',
proxyTable: {},
// Various Dev Server settings
host: 'localhost', // can be overwritten by process.env.HOST
port: 8080, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
autoOpenBrowser: false,
errorOverlay: true,
notifyOnErrors: true,
poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-
// Use Eslint Loader?
// If true, your code will be linted during bundling and
// linting errors and warnings will be shown in the console.
useEslint: true,
// If true, eslint errors and warnings will also be shown in the error overlay
// in the browser.
showEslintErrorsInOverlay: false,
/**
* Source Maps
*/ // https://webpack.js.org/configuration/devtool/#development
devtool: 'eval-source-map',
// If you have problems debugging vue-files in devtools,
// set this to false - it *may* help
// https://vue-loader.vuejs.org/en/options.html#cachebusting
cacheBusting: true,
// CSS Sourcemaps off by default because relative paths are "buggy"
// with this option, according to the CSS-Loader README
// (https://github.com/webpack/css-loader#sourcemaps)
// In our experience, they generally work as expected,
// just be aware of this issue when enabling this option.
cssSourceMap: false,
}
}
通过它的注释，我们可以理解它在dev中配置了静态路径、本地服务器配置项、Eslint、Source Maps等参数。如果我们需要在开发中，改动静态资源文件、服务器端口等设置，可以在这个文件中进行修改。
下面还有一个build的对象，它是在vue本地服务器启动时，打包的一些配置， 代码如下：
build: {
// Template for index.html
index: path.resolve(__dirname, '../dist/index.html'),
// Paths
assetsRoot: path.resolve(__dirname, '../dist'),
assetsSubDirectory: 'static',
assetsPublicPath: '/',
/**
* Source Maps
*/
productionSourceMap: true,
// https://webpack.js.org/configuration/devtool/#production
devtool: '#source-map',
// Gzip off by default as many popular static hosts such as
// Surge or Netlify already gzip all static assets for you.
// Before setting to `true`, make sure to:
