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304 lines
7.2 KiB
304 lines
7.2 KiB
# PostCSS Media Minmax |
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[![Build Status](https://travis-ci.org/postcss/postcss-media-minmax.svg?branch=master)](https://travis-ci.org/postcss/postcss-media-minmax) |
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[![NPM Downloads](https://img.shields.io/npm/dm/postcss-media-minmax.svg?style=flat)](https://www.npmjs.com/package/postcss-media-minmax) |
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[![NPM Version](http://img.shields.io/npm/v/postcss-media-minmax.svg?style=flat)](https://www.npmjs.com/package/postcss-media-minmax) |
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[![License](https://img.shields.io/npm/l/postcss-media-minmax.svg?style=flat)](http://opensource.org/licenses/MIT) |
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> 写简单优雅的 Media Queries! |
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Media Queries 中的 `min-width` 和 `max-width` 等属性非常容易混淆,每次看到他们,我都想哭。现在[新的规范](https://drafts.csswg.org/mediaqueries/#mq-range-context)中,可以使用更加直观的 `>=`或`<=` 替代 media queries 中的 min-/max- 前缀。 |
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**V2.1.0 开始支持 `>` 或 `<` 符号。** |
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这是一个实现 [CSS Media Queries Level 4](http://dev.w3.org/csswg/mediaqueries/) Polyfill 的插件,让你现在就可以使用这些特性,妈妈再也不用担心我记不住了,鹅妹子嘤! |
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[English](README.md) |
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----- |
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![Gif Demo](http://gtms02.alicdn.com/tps/i2/TB1UIjyGVXXXXcCaXXXx274FpXX-877-339.gif) |
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## 安装 |
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$ npm install postcss-media-minmax |
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## 快速开始 |
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示例 1: |
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```js |
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var fs = require('fs') |
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var postcss = require('postcss') |
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var minmax = require('postcss-media-minmax') |
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var css = fs.readFileSync('input.css', 'utf8') |
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var output = postcss() |
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.use(minmax()) |
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.process(css) |
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.css |
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console.log('\n====>Output CSS:\n', output) |
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``` |
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或者只需: |
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```js |
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var output = postcss(minmax()) |
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.process(css) |
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.css |
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``` |
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input.css: |
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```css |
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@media screen and (width >= 500px) and (width <= 1200px) { |
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.bar { |
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display: block; |
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} |
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} |
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``` |
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你将得到: |
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```css |
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@media screen and (min-width: 500px) and (max-width: 1200px) { |
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.bar { |
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display: block; |
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} |
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} |
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``` |
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## CSS 语法 |
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### [语法](http://dev.w3.org/csswg/mediaqueries/#mq-syntax) |
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``` |
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<mf-range> = <mf-name> [ '<' | '>' ]? '='? <mf-value> |
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| <mf-value> [ '<' | '>' ]? '='? <mf-name> |
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| <mf-value> '<' '='? <mf-name> '<' '='? <mf-value> |
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| <mf-value> '>' '='? <mf-name> '>' '='? <mf-value> |
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``` |
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![syntax](http://gtms03.alicdn.com/tps/i3/TB1Rje0HXXXXXXeXpXXccZJ0FXX-640-290.png) |
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PostCSS Media Minmax 目前并没有实现 `200px >= width` 或者 `200px <= width` 这样的语法,因为这样的语法可读性并不不是太好。 |
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## [取值(Values)](http://dev.w3.org/csswg/mediaqueries/#values) |
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**The special values:** |
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* [<ratio>](http://dev.w3.org/csswg/mediaqueries/#typedef-ratio) |
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<ratio> 是一个正(非零非负)的 <integer>(整型)取值,其后跟随0个或多个空白,接着跟随一个斜线(“/”),再跟随0个或多个空白,最后跟随一个正<integer>。 |
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```css |
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@media screen and (device-aspect-ratio: 16 / 9) { |
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/* rules */ |
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} |
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/* equivalent to */ |
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@media screen and (device-aspect-ratio: 16/9) { |
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/* rules */ |
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} |
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``` |
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* [<mq-boolean>](http://dev.w3.org/csswg/mediaqueries/#typedef-mq-boolean) |
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<mq-boolean> 值是一个 0 或 1 的 <integer>(整型)取值。其他任何整数无效。注意, 在 CSS 中 -0 总是等价于 0 的,所以也作为一种有效的 <mq-boolean> 取值。 |
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```css |
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@media screen and (grid: -0) { |
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/* rules */ |
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} |
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/* equivalent to */ |
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@media screen and (grid: 0) { |
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/* rules */ |
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} |
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``` |
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## 如何使用 |
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### 简写 |
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示例 1中同一个 Media features name 同时存在 `>=` 和 `<=` 时,可以简写为: |
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```css |
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@media screen and (500px <= width <= 1200px) { |
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.bar { |
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display: block; |
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} |
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} |
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/* 或者 */ |
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@media screen and (1200px >= width >= 500px) { |
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.bar { |
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display: block; |
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} |
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} |
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``` |
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都会得到一样的输出结果: |
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```css |
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@media screen and (min-width: 500px) and (max-width: 1200px) { |
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.bar { |
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display: block; |
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} |
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} |
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``` |
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**注意**:当 Media features name 在中间的时候,一定要保证两个 `<=` 或 `>=` 的方向一致,否则不会转换。 |
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例如在下面的示例中,width 大于等于 500px 同时又大于等于 1200px,这在语法和逻辑上都是错误的。 |
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```css |
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@media screen and (1200px <= width >= 500px) { |
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.bar { |
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display: block; |
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} |
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} |
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``` |
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### 支持的 Media features name |
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规范中目前以下属性支持 min-/max 前缀,PostCSS Media Minmax 全部支持自动转换。 |
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* `width` |
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* `height` |
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* `device-width` |
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* `device-height` |
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* `aspect-ratio` |
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* `device-aspect-ratio` |
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* `color` |
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* `color-index` |
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* `monochrome` |
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* `resolution` |
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### 支持在 `@custom-media` 中使用 & Node Watch |
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```js |
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var fs = require('fs') |
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var chokidar = require('chokidar') |
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var postcss = require('postcss') |
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var minmax = require('postcss-media-minmax') |
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var customMedia = require('postcss-custom-media') |
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var src = 'input.css' |
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console.info('Watching…\nModify the input.css and save.') |
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chokidar.watch(src, { |
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ignored: /[\/\\]\./, |
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persistent: true |
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}).on('all', |
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function(event, path, stats) { |
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var css = fs.readFileSync(src, 'utf8') |
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var output = postcss() |
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.use(customMedia()) |
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.use(minmax()) |
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.process(css) |
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.css; |
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fs.writeFileSync('output.css', output) |
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}) |
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``` |
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input.css: |
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```css |
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@custom-media --foo (width >= 20em) and (width <= 50em); |
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@custom-media --bar (height >= 300px) and (height <= 600px); |
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@media (--foo) and (--bar) { |
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} |
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``` |
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output.css: |
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```css |
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@media (min-width: 20em) and (max-width: 50em) and (min-height: 300px) and (max-height: 600px) { |
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} |
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``` |
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### Grunt |
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```js |
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module.exports = function(grunt) { |
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grunt.initConfig({ |
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pkg: grunt.file.readJSON('package.json'), |
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postcss: { |
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options: { |
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processors: [ |
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require('autoprefixer-core')({ browsers: ['> 0%'] }).postcss, //Other plugin |
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require('postcss-media-minmax')(), |
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] |
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}, |
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dist: { |
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src: ['src/*.css'], |
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dest: 'build/grunt.css' |
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} |
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} |
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}); |
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grunt.loadNpmTasks('grunt-contrib-uglify'); |
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grunt.loadNpmTasks('grunt-postcss'); |
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grunt.registerTask('default', ['postcss']); |
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} |
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``` |
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### Gulp |
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```js |
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var gulp = require('gulp'); |
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var rename = require('gulp-rename'); |
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var postcss = require('gulp-postcss'); |
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var selector = require('postcss-media-minmax') |
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var autoprefixer = require('autoprefixer-core') |
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gulp.task('default', function () { |
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var processors = [ |
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autoprefixer({ browsers: ['> 0%'] }), //Other plugin |
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minmax() |
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]; |
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gulp.src('src/*.css') |
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.pipe(postcss(processors)) |
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.pipe(rename('gulp.css')) |
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.pipe(gulp.dest('build')) |
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}); |
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gulp.watch('src/*.css', ['default']); |
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``` |
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## 贡献 |
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* 安装相关的依赖模块。 |
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* 尊重编码风格(安装 [EditorConfig](http://editorconfig.org/))。 |
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* 在[test](test)目录添加测试用例。 |
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* 运行测试。 |
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``` |
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$ git clone https://github.com/postcss/postcss-media-minmaxs.git |
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$ git checkout -b patch |
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$ npm install |
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$ npm test |
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``` |
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## 致谢 |
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* 感谢 PostCSS 作者 [Andrey Sitnik](https://github.com/ai),带给我们如此简单易用的 CSS 语法解析工具。 |
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* 感谢 [Tab Atkins Jr.](http://xanthir.com/contact/) 辛苦编写了 Media Queries Level 4 规范。 |
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* 感谢 [@紫云飞](http://weibo.com/p/1005051708684567) 对本插件的建议和帮助。 |
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## [Changelog](CHANGELOG.md) |
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## [License](LICENSE)
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