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postcss-rpxtorem
Advanced tools
Readme
A plugin for PostCSS that generates rem units from pixel units.
背景:小程序转换其他项目(vue等)时,需要把rpx转换成rem
$ npm install postcss-rpxtorem --save-dev
Pixels are the easiest unit to use (opinion). The only issue with them is that they don't let browsers change the default font size of 16. This script converts every px value to a rem from the properties you choose to allow the browser to set the font size.
关于rpx的描述:
rpx(responsive pixel): 可以根据屏幕宽度进行自适应。规定屏幕宽为750rpx。如在 iPhone6 上,屏幕宽度为375px,共有750个物理像素,则750rpx = 375px = 750物理像素,1rpx = 0.5px = 1物理像素。
设备 rpx换算px (屏幕宽度/750) px换算rpx (750/屏幕宽度) iPhone5 1rpx = 0.42px 1px = 2.34rpx iPhone6 1rpx = 0.5px 1px = 2rpx
With the default settings, only font related properties are targeted.
// input
h1 {
margin: 0 0 20rpx;
font-size: 32px;
line-height: 1.2;
letter-spacing: 1px;
}
// output
h1 {
margin: 0 0 1.25rem;
font-size: 2rem;
line-height: 1.2;
letter-spacing: 0.0625rem;
}
var fs = require('fs');
var postcss = require('postcss');
var rpxtorem = require('postcss-rpxtorem');
var css = fs.readFileSync('main.css', 'utf8');
var options = {
replace: false
};
var processedCss = postcss(rpxtorem(options)).process(css).css;
fs.writeFile('main-rem.css', processedCss, function (err) {
if (err) {
throw err;
}
console.log('Rem file written.');
});
Type: Object | Null
Default:
{
rootValue: 16,
unitPrecision: 5,
propList: ['*'],
selectorBlackList: [],
replace: true,
mediaQuery: false,
minPixelValue: 0
}
rootValue
(Number) The root element font size.unitPrecision
(Number) The decimal numbers to allow the REM units to grow to.propList
(Array) The properties that can change from px to rem.
*
to enable all properties. Example: ['*']
*
at the start or end of a word. (['*position*']
will match background-position-y
)!
to not match a property. Example: ['*', '!letter-spacing']
['*', '!font*']
selectorBlackList
(Array) The selectors to ignore and leave as px.
['body']
will match .body-class
[/^body$/]
will match body
but not .body
replace
(Boolean) replaces rules containing rems instead of adding fallbacks.mediaQuery
(Boolean) Allow px to be converted in media queries.minPixelValue
(Number) Set the minimum pixel value to replace.var gulp = require('gulp');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var rpxtorem = require('postcss-rpxtorem');
gulp.task('css', function () {
var processors = [
autoprefixer({
browsers: 'last 1 version'
}),
rpxtorem({
replace: false
})
];
return gulp.src(['build/css/**/*.css'])
.pipe(postcss(processors))
.pipe(gulp.dest('build/css'));
});
Currently, the easiest way to have a single property ignored is to use a capital in the pixel unit declaration.
// `rpx` is converted to `rem`
.convert {
font-size: 16rpx; // converted to 1rem
}
// `Px` or `PX` is ignored by `postcss-pxtorem` but still accepted by browsers
.ignore {
border: 1rPx solid; // ignored
border-width: 2RPX; // ignored
}
FAQs
A CSS post-processor that converts rpx to rem.
We found that postcss-rpxtorem demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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