vue項目中怎樣引入全局sass/less變量、function、mixin

讓我們斟酌下場景:當運用rem/vw開闢挪動端的時刻，你定義了一個px轉rem的函數,或許是網站配色的全局變量等，然後到工程里為每一個vue文件或許組件@import ‘publicfilename.scss’,那得反覆做如許的事情許多許多&＃8230;次，萬一這些公用文件目次途徑變怎麼辦呢，哭都來不及，想一想都以為恐懼呀！

接下來挽救我們的神器就要上台了&＃8212;sass-resources-loader,它能夠省去反覆性的引入，還支撐less,postcss等，詳細用法以下：

npm install -d sass-resource-loader

• 起首我們找到項目里build目次，在該目次下找到util.js
  更新前util.js代碼以下:

'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')
})
}
}
/**
* 增添 hljs 的 classname
*/
exports.wrapCustomClass = function (render) {
return function (...args) {
return render(...args)
.replace(' .replace('', '')
}
}
/**
* 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，我們起首找到我須要修正目的在哪：

// 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')
}

我們那sass為例，用sass-resources-loader對其革新：

/**
* sass Less 源文件
* @param name classFile
* @returns {string}
*/
function resolveResouce(name) {
return path.resolve(__dirname, '../static/' + name);
}
//導入全局sass mixin function等
function generateSassResourceLoader(){
var loaders = [
cssLoader,
//'postcss-loader',
'sass-loader',
{
loader:'sass-resources-loader',
options: {
//須要一個全局途徑
resources: [resolveResouce('index.scss')]
}
}
]
if(options.extract){
return ExtractTextPlugin.extract({
use:loaders,
fallback: 'vue-style-loader'
})
}else{
return ['vue-style-loader'].concat(loaders)
}
}

東西寫好好了，接下來直接把上門return對象做些調解，代碼以下

// 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')
}

從代碼中能夠看出，我們把sass和scss的loader換成我們本身依據sass-resources-loader寫的要領了，如許就完成了我們的目的。