1、node-sass 安装失败的原因及解决办法
npm install 时偶尔遇到报错：没有安装python或node-sass 安装失败的问题，在百度上找了很多的方法，但是执行之后，都没有什么效果，最后发现原来是因为没有卸载之前安装失败的包导致的。解决方案是npm uninstall node-sass，然后使用VPN重新安装了一遍就成功了。
node-sass 安装失败的原因：npm 安装 node-sass 依赖时，会从 github.com 上下载 .node 文件。由于国内网络环境的问题，这个下载时间可能会很长，甚至导致超时失败。这是使用 sass 可能都会遇到的郁闷的问题。解决方案就是使用其他源，或者使用工具下载，然后将安装源指定到本地。
解决方法一：使用淘宝镜像源（推荐）；设置变量 sass_binary_site，指向淘宝镜像地址。示例：
1 npm i node-sass --sass_binary_site=https://npm.taobao.org/mirrors/node-sass/ 2 3 // 也可以设置系统环境变量的方式。示例 4 // linux、mac 下 5 SASS_BINARY_SITE=https://npm.taobao.org/mirrors/node-sass/ npm install node-sass 6 7 // window 下 8 set SASS_BINARY_SITE=https://npm.taobao.org/mirrors/node-sass/ && npm install node-sass
或者设置全局镜像源：
1 npm config set sass_binary_site https://npm.taobao.org/mirrors/node-sass/
之后再涉及到 node-sass 的安装时就会从淘宝镜像下载。
解决方法二：使用 cnpm；使用 cnpm 安装 node-sass 会默认从淘宝镜像源下载，也是一个办法：
1 cnpm install node-sass
解决方法三：创建.npmrc文件；在项目根目录创建.npmrc文件，复制下面代码到该文件。
1 phantomjs_cdnurl=http://cnpmjs.org/downloads 2 sass_binary_site=https://npm.taobao.org/mirrors/node-sass/ 3 registry=https://registry.npm.taobao.org
保存后 删除之前安装失败的包(第一次安装请跳过此步)
1 npm uninstall node-sass
重新安装
1 npm install node-sass
后来另一个项目在没有使用VPN的情况下测试此方法，安装时报错 ERR! node-sass@3.8.0 postinstall: `node scripts/build.js 改用方法一成功。
解决方法四：下载 .node 到本地；到这里去根据版本号、系统环境，选择下载 .node 文件，然后安装时，指定变量 sass_binary_path，如：
1 npm i node-sass --sass_binary_path=/Users/lzwme/Downloads/darwin-x64-48_binding.node
安装失败后重新安装问题
之前安装失败，再安装就不去下载了，怎么办呢？那就先卸载再安装：
1 安装失败后重新安装问题 2 之前安装失败，再安装就不去下载了，怎么办呢？那就先卸载再安装：
1 $ npm install 2 3 > node-sass@4.7.2 install D:workspacegongsiwdf-wxreport ode_modules ode-sass 4 > node scripts/install.js 5 6 Downloading binary from https://npm.taobao.org/mirrors/node-sass//v4.7.2/win32-x64-83_binding.node 7 Cannot download "https://npm.taobao.org/mirrors/node-sass//v4.7.2/win32-x64-83_binding.node": 8 9 HTTP error 404 Not Found 10 11 Hint: If github.com is not accessible in your location 12 try setting a proxy via HTTP_PROXY, e.g. 13 14 export HTTP_PROXY=http://example.com:1234 15 16 or configure npm proxy via 17 18 npm config set proxy http://example.com:8080 19 20 > node-sass@4.7.2 postinstall D:workspacegongsiwdf-wxreport ode_modules ode-sass 21 > node scripts/build.js 22 23 Building: D:wenjiananzhuang ode ode.exe D:workspacegongsiwdf-wxreport ode_modules ode-gypin ode-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsas 24 s_library= 25 gyp info it worked if it ends with ok 26 gyp verb cli [ 27 gyp verb cli 'D:\wenjiananzhuang\node\node.exe', 28 gyp verb cli 'D:\workspace\gongsi\wdf-wxreport\node_modules\node-gyp\bin\node-gyp.js', 29 gyp verb cli 'rebuild', 30 gyp verb cli '--verbose', 31 gyp verb cli '--libsass_ext=', 32 gyp verb cli '--libsass_cflags=', 33 gyp verb cli '--libsass_ldflags=', 34 gyp verb cli '--libsass_library=' 35 gyp verb cli ] 36 gyp info using node-gyp@3.6.2 37 gyp info using node@14.15.1 | win32 | x64 38 gyp verb command rebuild [] 39 gyp verb command clean [] 40 gyp verb clean removing "build" directory 41 gyp verb command configure [] 42 gyp verb check python checking for Python executable "python2" in the PATH 43 gyp verb `which` failed Error: not found: python2 44 gyp verb `which` failed at getNotFoundError (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:13:12) 45 gyp verb `which` failed at F (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:68:19) 46 gyp verb `which` failed at E (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:80:29) 47 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:89:16 48 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexeindex.js:42:5 49 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexewindows.js:36:5 50 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:183:21) 51 gyp verb `which` failed python2 Error: not found: python2 52 gyp verb `which` failed at getNotFoundError (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:13:12) 53 gyp verb `which` failed at F (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:68:19) 54 gyp verb `which` failed at E (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:80:29) 55 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:89:16 56 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexeindex.js:42:5 57 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexewindows.js:36:5 58 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:183:21) { 59 gyp verb `which` failed code: 'ENOENT' 60 gyp verb `which` failed } 61 gyp verb check python checking for Python executable "python" in the PATH 62 gyp verb `which` failed Error: not found: python 63 gyp verb `which` failed at getNotFoundError (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:13:12) 64 gyp verb `which` failed at F (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:68:19) 65 gyp verb `which` failed at E (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:80:29) 66 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:89:16 67 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexeindex.js:42:5 68 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexewindows.js:36:5 69 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:183:21) 70 gyp verb `which` failed python Error: not found: python 71 gyp verb `which` failed at getNotFoundError (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:13:12) 72 gyp verb `which` failed at F (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:68:19) 73 gyp verb `which` failed at E (D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:80:29) 74 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_moduleswhichwhich.js:89:16 75 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexeindex.js:42:5 76 gyp verb `which` failed at D:workspacegongsiwdf-wxreport ode_modulesisexewindows.js:36:5 77 gyp verb `which` failed at FSReqCallback.oncomplete (fs.js:183:21) { 78 gyp verb `which` failed code: 'ENOENT' 79 gyp verb `which` failed } 80 gyp verb could not find "python". checking python launcher 81 gyp verb could not find "python". guessing location 82 gyp verb ensuring that file exists: C:Python27python.exe 83 gyp ERR! configure error 84 gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable. 85 gyp ERR! stack at PythonFinder.failNoPython (D:workspacegongsiwdf-wxreport ode_modules ode-gyplibconfigure.js:483:19) 86 gyp ERR! stack at PythonFinder.<anonymous> (D:workspacegongsiwdf-wxreport ode_modules ode-gyplibconfigure.js:508:16) 87 gyp ERR! stack at D:workspacegongsiwdf-wxreport ode_modulesgraceful-fspolyfills.js:284:29 88 gyp ERR! stack at FSReqCallback.oncomplete (fs.js:183:21) 89 gyp ERR! System Windows_NT 10.0.18363 90 gyp ERR! command "D:\wenjiananzhuang\node\node.exe" "D:\workspace\gongsi\wdf-wxreport\node_modules\node-gyp\bin\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags= 91 " "--libsass_ldflags=" "--libsass_library=" 92 gyp ERR! cwd D:workspacegongsiwdf-wxreport ode_modules ode-sass 93 gyp ERR! node -v v14.15.1 94 gyp ERR! node-gyp -v v3.6.2 95 gyp ERR! not ok 96 Build failed with error code: 1 97 npm WARN rollback Rolling back ajv@4.11.8 failed (this is probably harmless): EPERM: operation not permitted, lstat 'D:workspacegongsiwdf-wxreport ode_modulesfsevents ode_modules' 98 npm WARN rollback Rolling back tar-pack@3.4.0 failed (this is probably harmless): EPERM: operation not permitted, lstat 'D:workspacegongsiwdf-wxreport ode_modulesfsevents ode_modules' 99 npm WARN wd-vue-stat@0.0.1 No repository field. 100 npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.1.3 (node_modulesfsevents): 101 npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) 102 103 npm ERR! code ELIFECYCLE 104 npm ERR! errno 1 105 npm ERR! node-sass@4.7.2 postinstall: `node scripts/build.js` 106 npm ERR! Exit status 1 107 npm ERR! 108 npm ERR! Failed at the node-sass@4.7.2 postinstall script. 109 npm ERR! This is probably not a problem with npm. There is likely additional logging output above. 110 111 npm ERR! A complete log of this run can be found in: 112 npm ERR! D:wenjiananzhuang ode ode_cache\_logs2020-12-14T05_46_09_374Z-debug.log
在这里，我选择的是方法,先删除已有的包（npm uninstall node-sass），在设置相关的镜像(npm i node-sass --sass_binary_site=https://npm.taobao.org/mirrors/node-sass/)；在执行npm install 就可以了