Detailed explanation of Build and Serve using Angular CLI

This article mainly introduces the detailed explanation of Build and Serve using Angular CLI. Now I share it with you and give it as a reference.

Build.

Build will mainly do the following actions:

1. Compile the project file and output it Go to a certain directory

2. Build targets determine the output result

3. bundling packaging

4. Production The build of the environment will also perform uglify and tree-shaking (removing useless code)

ng build.

You can read the help first :

ng build --help

For the development environment, use the command ng build.

By default, its output directory is in .angular-cli. The ourDir attribute in the json file is configured, and the default is the /dist directory.

After building, you will see these files in dist:

1. inline.bundle.js This is webpack runtime.

2. main.bundle.js is the program code.

3. pollyfills.bundle.js is the browser’s Pollyfills.

4. styles.bundle.js Styles

5. vendor.bundle.js is angular and third-party library

You can use source-map-explorer to analyze dependencies and check which modules and classes are in the bundle.

First modify the code in the previous example:

Execute ng build:

You can see that these files are generated.

Change the index in dist. Format the html and take a look:

You can see that it refers to the 5 generated js files.

Open main.bundle.js and you can see The code I wrote:

Run the program below: ng serve -o:

You can see it in ng serve When, the above file was loaded.

Because ng build is a development build, no optimization has been done, and the file is quite large.

Looking at the file directory at this time, there is no dist directory:

So how are these files served?

This is because webpack is served in memory at this time.

Use source-map-explorer for analysis below. First install it:

npm install --save-dev source-map-explorer

Then execute ng build, and then execute:

.\node_modules\.bin\source-map-explorer dist\main.bundle.js

The result will generate this graph:

Look at the situation of vendor.bundle:

.\node_modules\.bin\source-map-explorer dist\vendor.bundle.js

There are more things here.

Build Targets and Environment.

Environment refers to which environment file is used:

And Targets is used to determine how the project file is optimized.

See Let’s compare development and production builds.

##environment..prod.tsCacheOnly cache images referenced in cssAll build filessource mapsGenerateDo not generate How to process cssGlobal css output to js fileThe generated is css file##uglifyTree-ShakingAOTBundling Packaging--build-optimizer--named-chunks--output-hashing

	ng build	##ng build --prod
Environment	environment.ts
not	is
Do not remove useless code	Remove useless code
No	is
is	is
No	##Yes (with AOT and Angular5)
Yes	No
media	all	下面命令都是针对开发时的build, 它们的作用是一样的: ng build ng build --dev ng build --dev -e=dev ng build --target=development --environment=dev 下面则是生产build: ng build --prod ng build --prod -e=prod ng build --target=production --environment=prod 其它常用的参数还有: --sourcemap -sm 生成source map --aot Ahead of Time编译 --watch -w Watch并rebuild --environment -e Build环境 --target -t Build target --dev 表示dev env和target --prod 表示prod env和target Production Build. 先使用--aot: ng build --aot 使用aot之后可以看到 vendor.bundle的大小降了很多, 只有1.5m左右了. 执行aot会去掉一些程序执行不需要的代码, 例如angular的compiler这时就不在build输出的文件里了(可以使用source-map-explorer查看). 试试生产环境: ng build --prod 可以看到所有的文件都非常小了, 并且没有vendor了(因为prod下--build-optimizer起作用所以vendor没有了, 但可以使用--vendor-chunk true给弄出来). Serve. ng serve. 已经一直在用了, 下面看看它常用的参数: --open -o 打开默认浏览器 --port -p 端口 --live-reload -lr 发生变化时重新加载网页(默认开启的) --ssl 使用https --proxy-config -pc 代理配置 --prod 在内存中serve 生产模式build的文件 试试 --prod: ng serve --prod 通过文件大小可以看出确实是prod build的. ng eject. 为项目生成webpack配置和脚本. 执行该命令试试: 看看有哪些变化: .angular-cli.json: package.json: 命令脚本都变了 还多出来一个webpack.config.js文件: 为什么要这么做呢? 可以对项目更深入的配置.... 这时运行程序就是 npm start了. 我还是把reject恢复回去吧, 使用git来恢复吧. 如果需要Serve 其他js/css/assets文件: 放在.angular-cli.json就行, 例如jquery就应该放在scripts里面. 上面是我整理给大家的，希望今后会对大家有帮助。 相关文章： Vue项目中如何引入icon图标 JavaScript中的E-mail 地址格式验证 javascript性能优化之分时函数的介绍

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