让我们考虑下场景:当使用rem/vw开发移动端的时候，你定义了一个px转rem的函数,或者是网站配色的全局变量等，然后到工程里为每个vue文件或者组件@import ‘publicfilename.scss',那得重复做这样的工作很多很多...次，万一这些公用文件目录路径变怎么办呢，哭都来不及，想想都觉得恐怖呀！
接下来拯救我们的神器就要登场了---sass-resources-loader,它可以省去重复性的引入，还支持less,postcss等，具体用法如下：
npm install -d sass-resource-loader
首先我们找到项目里build目录，在该目录下找到util.js
更新前util.js代码如下:
'use strict'
const path = require('path')
const config = require('../config')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const packageConfig = require('../package.json')
exports.assetsPath = function (_path) {
const assetsSubDirectory = process.env.NODE_ENV === 'production'
? config.build.assetsSubDirectory
: config.dev.assetsSubDirectory
return path.posix.join(assetsSubDirectory, _path)
}
exports.cssLoaders = function (options) {
options = options || {}
const cssLoader = {
loader: 'css-loader',
options: {
sourceMap: options.sourceMap
}
}
// generate loader string to be used with extract text plugin
function generateLoaders (loader, loaderOptions) {
const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader]
if (loader) {
loaders.push({
loader: loader + '-loader',
options: Object.assign({}, loaderOptions, {
sourceMap: options.sourceMap
})
})
}
// Extract CSS when that option is specified
// (which is the case during production build)
if (options.extract) {
return ExtractTextPlugin.extract({
use: loaders,
fallback: 'vue-style-loader'
})
} else {
return ['vue-style-loader'].concat(loaders)
}
}
// https://vue-loader.vuejs.org/en/configurations/extract-css.html
return {
css: generateLoaders(),
postcss: generateLoaders(),
less: generateLoaders('less'),
sass: generateLoaders('sass', { indentedSyntax: true }),
scss: generateLoaders('sass'),
stylus: generateLoaders('stylus'),
styl: generateLoaders('stylus')
}
}
// Generate loaders for standalone style files (outside of .vue)
exports.styleLoaders = function (options) {
const output = []
const loaders = exports.cssLoaders(options)
for (const extension in loaders) {
const loader = loaders[extension]
output.push({
test: new RegExp('\\.' + extension + '$'),
use: loader
})
}
return output
}
exports.createNotifierCallback = () => {
const notifier = require('node-notifier')
return (severity, errors) => {
if (severity !== 'error') return
const error = errors[0]
const filename = error.file && error.file.split('!').pop()
notifier.notify({
title: packageConfig.name,
message: severity + ': ' + error.name,
subtitle: filename || '',
icon: path.join(__dirname, 'logo.png')
})
}
}
/**
* 增加 hljs 的 classname
*/
exports.wrapCustomClass = function (render) {
return function (...args) {
return render(...args)
.replace('<code class="', '<code class="hljs ')
.replace('<code>', '<code class="hljs">')
}
}
/**
* Format HTML string
*/
exports.convertHtml = function (str) {
return str.replace(/(&#x)(\w{4});/gi, $0 => String.fromCharCode(parseInt(encodeURIComponent($0).replace(/(%26%23x)(\w{4})(%3B)/g, '$2'), 16)))
}
看util.js文件，我们首先找到我需要修改目标在哪：
// https://vue-loader.vuejs.org/en/configurations/extract-css.html
return {
css: generateLoaders(),
postcss: generateLoaders(),
less: generateLoaders('less'),
sass: generateLoaders('sass', { indentedSyntax: true }),
scss: generateLoaders('sass'),
stylus: generateLoaders('stylus'),
styl: generateLoaders('stylus')
}
我们那sass为例，用sass-resources-loader对其改造：
/**
* sass Less 源文件
* @param name classFile
* @returns {string}
*/
function resolveResouce(name) {
return path.resolve(__dirname, '../static/' + name);
}
//导入全局sass mixin function等
function generateSassResourceLoader(){
var loaders = [
cssLoader,
//'postcss-loader',
'sass-loader',
{
loader:'sass-resources-loader',
options: {
//需要一个全局路径
resources: [resolveResouce('index.scss')]
}
}
]
if(options.extract){
return ExtractTextPlugin.extract({
use:loaders,
fallback: 'vue-style-loader'
})
}else{
return ['vue-style-loader'].concat(loaders)
}
}
工具写好好了，接下来直接把上门return对象做些调整，代码如下
// https://vue-loader.vuejs.org/en/configurations/extract-css.html
return {
css: generateLoaders(),
postcss: generateLoaders(),
less: generateLoaders('less'),
sass:generateSassResourceLoader(),
scss:generateSassResourceLoader(),
stylus: generateLoaders('stylus'),
styl: generateLoaders('stylus')
}
从代码中可以看出，我们把sass和scss的loader换成我们自己根据sass-resources-loader写的方法了，这样就实现了我们的目标。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
