


Gulp Study Guide CSS Merger, Compression, MD5 Naming and Path Replacement_html/css_WEB-ITnose
Continued from the previous article: Gulp Learning Guide, here we mainly record the use of gulp to merge, compress CSS, MD5 naming and replace the CSS files introduced in the file. Of course, this series of operations are based on gulp For plug-ins, the following plug-ins are mainly used:
var concat = require('gulp-concat');//- 多个文件合并为一个;var minifyCss = require('gulp-minify-css');//- 压缩CSS为一行; var rev = require('gulp-rev');//- 对文件名加MD5后缀var revCollector = require('gulp-rev-collector');//- 路径替换
Install the Gulp plug-in into the local project
npm init//- 生成一个 package.json,里面是一些常规的配置信息npm install gulp gulp-concat gulp-minify-css gulp-rev gulp-rev-collector --save-dev//- 安装插件到项目目录内
After completing the above two steps, it will be generated in our project A package.json file and a node_modules directory
Create the configuration file gulpfile.js
Create a gulpfile.js file in the project root directory (must be this file name~), the content is Configuration information of the above plug-ins:
var gulp = require('gulp');var concat = require('gulp-concat'); //- 多个文件合并为一个;var minifyCss = require('gulp-minify-css'); //- 压缩CSS为一行;var rev = require('gulp-rev'); //- 对文件名加MD5后缀var revCollector = require('gulp-rev-collector'); //- 路径替换gulp.task('concat', function() { //- 创建一个名为 concat 的 task gulp.src(['./css/wap_v3.1.css', './css/wap_v3.1.3.css']) //- 需要处理的css文件,放到一个字符串数组里 .pipe(concat('wap.min.css')) //- 合并后的文件名 .pipe(minifyCss()) //- 压缩处理成一行 .pipe(rev()) //- 文件名加MD5后缀 .pipe(gulp.dest('./css')) //- 输出文件本地 .pipe(rev.manifest()) //- 生成一个rev-manifest.json .pipe(gulp.dest('./rev')); //- 将 rev-manifest.json 保存到 rev 目录内});gulp.task('rev', function() { gulp.src(['./rev/*.json', './application/**/header.php']) //- 读取 rev-manifest.json 文件以及需要进行css名替换的文件 .pipe(revCollector()) //- 执行文件内css名的替换 .pipe(gulp.dest('./application/')); //- 替换后的文件输出的目录});gulp.task('default', ['concat', 'rev']);
Run results
After passing the above configuration, you can start running gulp to perform related operations on our project;
Use the gulp command to run the Gulp.js build program
First run the concat task to generate a rev-manifest.json file
Then run the rev task to replace the css introduced in the file
YuanWingdeMacBook-Pro:m YuanWing$ gulp concat[11:47:02] Using gulpfile ~/SVN/JKD/m/gulpfile.js[11:47:03] Starting 'concat'...[11:47:03] Finished 'concat' after 12 msYuanWingdeMacBook-Pro:m YuanWing$ gulp rev[11:47:17] Using gulpfile ~/SVN/JKD/m/gulpfile.js[11:47:17] Starting 'rev'...[11:47:17] Finished 'rev' after 10 msYuanWingdeMacBook-Pro:m YuanWing$
rev-manifest.jsonFile content:
{ "wap.min.css": "wap.min-c49f62a273.css"}
header.phpComparison before and after replacement:
Before replacement :
After replacement:
gulp-rev-collector's file path replacement is based on rev-manifest.json, so the .json file must be generated first and then replaced;
Conclusion
The plug-ins used above only use a very small part of their own functions. If you are interested, you can experience it yourself:
gulp- rev
gulp-rev-collector
gulp-minify-css
gulp-concat

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.


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