問題2更好的解決方案是這個

Node Sass could not find a binding for your current environment: Windows 64-bit with Node.js 8.x
Found bindings for the following Environments: Linux 64-bit with Node.js 12.x

以下是sass-loader的官方文檔

By default the loader resolve the implementation based on your dependencies. Just add required implementation to package.json (sass or node-sass package) and install dependencies.

Example where the sass-loader loader uses the sass (dart-sass) implementation:
package.json

{
  "devDependencies": {
    "sass-loader": "^7.2.0",
    "sass": "^1.22.10"
  }
}

Example where the sass-loader loader uses the node-sass implementation:

package.json

{
  "devDependencies": {
    "sass-loader": "^7.2.0",
    "node-sass": "^5.0.0"
  }
}

也就是說，可以直接使用sass而不用node-sass。
所以直接刪除掉node-sass，然后安裝sass吧
npm install sass sass-loader -D

1. 項目中引入SCSS

   $ npm i sass-loader@10.x node-sass -D

   因為Vue環(huán)境用的是Vue@2.x ，如果直接安裝sass-loader會安裝11.x，該版本與Vue2.x不適配，可以裝10.x

   node-sass自動安裝，我本地是5.0.0

   -S 是 --save ：安裝在packages.json的dependencies下面 -D 是 --save-dev ：安裝在packages.json的devDependencies下面

2. 安裝好node-sass和sass-loader以后，重新跑項目，報以下錯誤

   Node Sass could not find a binding for your current environment: Windows 64-bit with Node.js 8.x

   Found bindings for the following Environments: Linux 64-bit with Node.js 12.x

   node -v查看本地的node 版本就是12.x，但是sass-loader需要的是8.x

   如果本地有node.js的8.x版本，直接切換當前的node.js版本就行，使用N或者nvm

   如果本地沒有

   1. 官網(wǎng)找到對應的版本，下載安裝。

   2. $ npm rebuild sass-loader

   3. 重新運行項目