npm install 关于 sass 屡次失败问题

报错一：npm install --save-dev node-sass：各种报错。

15341@DESKTOP-J9UMI41 MINGW64 ~/Desktop/Practice/pro3 (master)
$ npm install --save-dev node-sass
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142   //mac 问题Windons不用管

> node-sass@4.14.1 install C:Users15341DesktopPracticepro3
ode_modules
ode-sass
> node scripts/install.js
..............
Build failed with error code: 1
npm WARN sass-loader@8.0.2 requires a peer of webpack@^4.36.0 || ^5.0.0 but none is installed. You must install peer dependencies yourself.  　　　　　　　　　//sass-loder版本太高
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.3 (node_modulesfsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_moduleswebpack-dev-server
ode_modulesfsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_moduleswatchpack-chokidar2
ode_modulesfsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! node-sass@4.14.1 postinstall: `node scripts/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the node-sass@4.14.1 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:Software
odejs
ode_cache\_logs2020-05-18T08_21_51_160Z-debug.log

//sass-loder版本太高, 解决方法：

1.现在package.json文件中找到  sass-loader ：

　　"sass-loader" : "^8.0.0",===> "sass-loader": "^7.3.1"

2.先清除已经安装过的版本：

　　npm uninstall node-sass 　　//这是sass-loader的依赖

　　npm uninstall sass-loader 

　　npm uninstall style-loader　　//这个我没碰到过报错

3.再次安装:

　　npm i node-sass --sass_binary_site=https://npm.taobao.org/mirrors/node-sass/　　//淘宝镜像安装node-sass　　　　更多方法参考：https://blog.csdn.net/ken_ding/article/details/85623092

　　npm install sass-loader@7.3.1 --save-dev　　　　　　　　　　　　　　　　　　//安装sass-loader

　　npm install style-loader --save-dev //安装style-loader

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报错二：接下来会碰到新的错误：

Module not found: Error: Can't resolve 'css' in 'C:Users15341DesktopPracticepro2'
BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.
                 You need to specify 'css-loader' instead of 'css',
                 see https://webpack.js.org/guides/migrating/#automatic-loader-module-name-extension-removed
 @ ./src/main.js 8:0-34
 @ multi (webpack)-dev-server/client?http://0.0.0.0:8083 webpack/hot/dev-server ./src/main.js

原因：使用加载器时，不再允许省略‘-loader’后缀”，需要指定“css-loader”而不是css，webpack新版本不支持缩写，将提示的webpack.config.js位置改成全写

最后在webpack.config.js 中module下添加如下代码：（我的在webpack.base.conf.js中）

 代码如下：

{
    test: //less$/,
    loader: 'style-loader!css-loader!less-loader'
}

 关于不再允许省略‘-loader’后缀问题加一篇引用，我是在使用这个之前按文章中方法解决了问题。
https://blog.csdn.net/LeapMotion1/article/details/78416595?utm_source=blogxgwz8

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