当我运行“npm run build”时,我得到4个或5个javascript文件,而不是获取单个build.js文件。这些javascript文件大小约为1MB。为什么会这样?
以下是文件夹结构
build.js
// https://github.com/shelljs/shelljs
require('./check-versions')()
require('shelljs/global')
env.NODE_ENV = 'production'
var path = require('path')
var config = require('../config')
var ora = require('ora')
var webpack = require('webpack')
var webpackConfig = require('./webpack.prod.conf')
console.log(
' Tip:\n' +
' Built files are meant to be served over an HTTP server.\n' +
' Opening index.html over file:// won\'t work.\n'
)
var spinner = ora('building for production...')
spinner.start()
var assetsPath = path.join(config.build.assetsRoot, config.build.assetsSubDirectory)
rm('-rf', assetsPath)
mkdir('-p', assetsPath)
cp('-R', 'static/*', assetsPath)
webpack(webpackConfig, function (err, stats) {
spinner.stop()
if (err) throw err
process.stdout.write(stats.toString({
colors: true,
modules: false,
children: false,
chunks: false,
chunkModules: false
}) + '\n')
})
webpack.prod.conf.js
var path = require('path')
var config = require('../config')
var utils = require('./utils')
var webpack = require('webpack')
var merge = require('webpack-merge')
var baseWebpackConfig = require('./webpack.base.conf')
var ExtractTextPlugin = require('extract-text-webpack-plugin')
var HtmlWebpackPlugin = require('html-webpack-plugin')
var env = config.build.env
var webpackConfig = merge(baseWebpackConfig, {
module: {
loaders: utils.styleLoaders({ sourceMap: config.build.productionSourceMap, extract: true })
},
devtool: config.build.productionSourceMap ? '#source-map' : false,
output: {
path: config.build.assetsRoot,
filename: utils.assetsPath('js/[name].[chunkhash].js'),
chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
},
vue: {
loaders: utils.cssLoaders({
sourceMap: config.build.productionSourceMap,
extract: true
})
},
plugins: [
// http://vuejs.github.io/vue-loader/en/workflow/production.html
new webpack.DefinePlugin({
'process.env': env
}),
new webpack.optimize.UglifyJsPlugin({
compress: {
warnings: true
}
}),
new webpack.optimize.OccurrenceOrderPlugin(),
// extract css into its own file
new ExtractTextPlugin(utils.assetsPath('css/[name].[contenthash].css')),
// generate dist index.html with correct asset hash for caching.
// you can customize output by editing /index.html
// see https://github.com/ampedandwired/html-webpack-plugin
new HtmlWebpackPlugin({
filename: config.build.index,
template: 'index.html',
inject: true,
minify: {
removeComments: true,
collapseWhitespace: true,
removeAttributeQuotes: true
// more options:
// https://github.com/kangax/html-minifier#options-quick-reference
},
// necessary to consistently work with multiple chunks via CommonsChunkPlugin
chunksSortMode: 'dependency'
}),
// split vendor js into its own file
new webpack.optimize.CommonsChunkPlugin({
name: 'vendor',
minChunks: function (module, count) {
// any required modules inside node_modules are extracted to vendor
return (
module.resource &&
/\.js$/.test(module.resource) &&
module.resource.indexOf(
path.join(__dirname, '../node_modules')
) === 0
)
}
}),
// extract webpack runtime and module manifest to its own file in order to
// prevent vendor hash from being updated whenever app bundle is updated
new webpack.optimize.CommonsChunkPlugin({
name: 'manifest',
chunks: ['vendor']
})
]
})
if (config.build.productionGzip) {
var CompressionWebpackPlugin = require('compression-webpack-plugin')
webpackConfig.plugins.push(
new CompressionWebpackPlugin({
asset: '[path].gz[query]',
algorithm: 'gzip',
test: new RegExp(
'\\.(' +
config.build.productionGzipExtensions.join('|') +
')$'
),
threshold: 10240,
minRatio: 0.8
})
)
}
module.exports = webpackConfig
答案 0 :(得分:3)
所有这些都存在,因为您的配置文件说它们应该。
manifest.js
因配置而存在:
// extract webpack runtime and module manifest to its own file in order to
// prevent vendor hash from being updated whenever app bundle is updated
vendor.js
因配置而存在:
// split vendor js into its own file
和.map
文件source maps用于调试:
sourceMap: config.build.productionSourceMap
答案 1 :(得分:3)
您的.map文件是源地图。
源地图是从已转换的源映射到的映射文件 原始来源,使浏览器能够重建原始内容 在调试器中提供并呈现重建的原始文件 »Source
你不需要在制作中使用它们,因为它们会使应用程序变得更大,你也不应该在那里进行调试。
您可以通过设置productionSourceMap: false
将其关闭。检查 config \ index.js 文件并查找此部分:
module.exports = {
build: {
env: require('./prod.env'),
productionSourceMap: false
....
答案 2 :(得分:1)
如上一条评论中所述,您可以获得它们,因为vue-cli的默认webpack配置已设置为执行此操作。通常app.js
包含您自定义的所有代码,包括.vue
个文件和您的主要javascript文件。如果我没有记错的话,venodr.js
文件会从node_modules中收集所有导入并将它们放在这个文件中。
因此,例如,如果你import vueRouter from 'vue-router'
,它会将vue-router javascript放入vendor.js
文件,因为它被用作npm的插件。由于您不经常在生产中更改插件,因此将它们放在单独的文件中非常有用,因为它们会被缓存。在您的应用程序中更新某些内容并进行部署后,用户将下载更新的app.js
,其中包含您为应用程序编写的代码,而不是再次下载所有内容(插件+您的应用程序)。
在单独的js包中插入插件是许多框架/设置中常用的做法。 (例如.NET MVC捆绑包)