Npm 安装量角器时出现gyp错误

当我尝试安装时

npm i protractor

我有错误。我已经安装了 msvs_2015版 GYP_MSVS_版本=2015

C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Platforms\x64\Microsoft.Cpp.x64.Targets(514,5): error MSB8008: Specified platform too lset (v140) is not installed or invalid. Please make sure that a supported PlatformToolset value is selected. [D:\Projects\angularjs\no de_modules\utf-8-validate\build\validation.vcxproj]
gyp ERR! build error
gyp ERR! stack Error: `C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onExit (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\build.js:270:23)
gyp ERR! stack     at emitTwo (events.js:100:13)
gyp ERR! stack     at ChildProcess.emit (events.js:185:7)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
gyp ERR! System Windows_NT 6.1.7601
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd D:\Projects\angularjs\node_modules\utf-8-validate
gyp ERR! node -v v5.5.0
gyp ERR! node-gyp -v v3.0.3
gyp ERR! not ok

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确保满足此处列出的所有步骤

之后，如果仍然不起作用，请尝试

node-gyp configure --msvs_version=2015
or the npm example
npm install --msvs_version=2015