wecui
Version:
一款基于Vue2.x版本的移动端web组件
90 lines (63 loc) • 2.68 kB
Markdown
# Pixrem
[](https://travis-ci.org/robwierzbowski/node-pixrem)
[PostCSS](https://github.com/ai/postcss) plugin that generates pixel fallbacks for rem units.
## Installation
`npm install --save pixrem`
## Usage
Pixrem is a CSS post-processor that, given CSS and a root em value, returns CSS with pixel unit fallbacks or replacements. It's based on [browser data](http://caniuse.com/rem) so only needed fallbacks will be added. Basically, it's for IE8 or less, and for IE9 & IE10 in the `font` shorthand property and in pseudo-elements.
### Example
```js
'use strict';
var fs = require('fs');
var pixrem = require('pixrem');
var postcss = require('postcss');
var css = fs.readFileSync('main.css', 'utf8');
var processedCss = postcss([pixrem]).process(css).css;
fs.writeFile('main.with-fallbacks.css', processedCss, function (err) {
if (err) {
throw err;
}
console.log('IE8, you\'re welcome.');
});
```
Pixrem takes this:
```css
.sky {
margin: 2.5rem 2px 3em 100%;
color: blue;
}
@media screen and (min-width: 20rem) {
.leaf {
margin-bottom: 1.333rem;
font-size: 1.5rem;
}
}
```
And returns this:
```css
.sky {
margin: 80px 2px 3em 100%;
margin: 2.5rem 2px 3em 100%;
color: blue;
}
@media screen and (min-width: 20rem) {
.leaf {
margin-bottom: 1.333rem;
font-size: 1.5rem;
}
}
```
### Options
Type: `Object | Null`
Default: `{rootValue: 16, replace: false, atrules: false, html: true, browsers: 'ie <= 8', unitPrecision: 3}`
- `rootValue` the root element font size. Can be `px`, `rem`, `em`, `%`, or unitless pixel value. Pixrem also tries to get the root font-size from CSS (`html` or `:root`) and overrides this option. Use `html` option to disable this behaviour.
- `replace` replaces rules containing `rem`s instead of adding fallbacks.
- `atrules` generates fallback in at-rules too (media-queries)
- `html` overrides root font-size from CSS `html {}` or `:root {}`
- `browsers` sets browser's range you want to target, based on [browserslist](https://github.com/ai/browserslist)
- `unitPrecision` control the significant digits after the decimal point
## Contribute
Report bugs and feature proposals in the [Github issue tracker](https://github.com/robwierzbowski/node-pixrem/issues). Run tests with `npm test`. In lieu of a formal styleguide, take care to maintain the existing coding style.
## License
[MIT](http://en.wikipedia.org/wiki/MIT_License)
[](https://bitdeli.com/free "Bitdeli Badge")