为什么我的node_modules中有@angular/core，但仍然出现此错误？

我从 angular.io 下载了一个示例项目，从这里https://angular.io/ generated/zips/cli-quickstart/cli-quickstart.zip https://angular.io/generated/zips/cli-quickstart/cli-quickstart.zip

并在根文件夹中运行 npm install，如本教程所示

https://www.youtube.com/watch?v=bJKejcQJqHE https://www.youtube.com/watch?v=bJKejcQJqHE

不知何故，尽管我在node_modules和package.json中都有相应的角度包，但我仍然得到了这个：

Hash: faeff28da7a6ba00851d                    
Time: 8547ms
chunk    {0} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 171 kB {4} [initial] [rendered]
chunk    {1} main.bundle.js, main.bundle.js.map (main) 5.41 kB {3} [initial] [rendered]
chunk    {2} styles.bundle.js, styles.bundle.js.map (styles) 11.5 kB {4} [initial] [rendered]
chunk    {3} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.18 MB [initial] [rendered]
chunk    {4} inline.bundle.js, inline.bundle.js.map (inline) 0 bytes [entry] [rendered]

ERROR in /home/ivan/anglr-lrn/src/app/app.component.ts (1,27): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/app/app.component.ts (8,14): Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (1,31): Cannot find module '@angular/platform-browser'.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (2,26): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (16,14): Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.

ERROR in /home/ivan/anglr-lrn/src/main.ts (1,32): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/main.ts (2,40): Cannot find module '@angular/platform-browser-dynamic'.

ERROR in Could not resolve module @angular/core
webpack: Failed to compile.
webpack: Compiling...
Hash: faeff28da7a6ba00851d                                               
Time: 807ms
chunk    {0} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 171 kB {4} [initial]
chunk    {1} main.bundle.js, main.bundle.js.map (main) 5.41 kB {3} [initial]
chunk    {2} styles.bundle.js, styles.bundle.js.map (styles) 11.5 kB {4} [initial]
chunk    {3} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.18 MB [initial]
chunk    {4} inline.bundle.js, inline.bundle.js.map (inline) 0 bytes [entry]

ERROR in /home/ivan/anglr-lrn/src/app/app.component.ts (1,27): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/app/app.component.ts (8,14): Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (1,31): Cannot find module '@angular/platform-browser'.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (2,26): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/app/app.module.ts (16,14): Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning.

ERROR in /home/ivan/anglr-lrn/src/main.ts (1,32): Cannot find module '@angular/core'.

ERROR in /home/ivan/anglr-lrn/src/main.ts (2,40): Cannot find module '@angular/platform-browser-dynamic'.
webpack: Failed to compile.

这在类似的情况下有效：

在你的机器上卸载 NodeJS.

如果使用可下载的软件包安装程序安装 - （添加删除程序 > 选择 NodeJS 并单击卸载）

下载并安装 NodeJS 6.10.3 (https://nodejs.org/dist/v6.10.3/node-v6.10.3-x64.msi https://nodejs.org/dist/v6.10.3/node-v6.10.3-x64.msi)

清理node_modules文件夹

rm -rf node_modules/

清理所有临时文件夹

运行这些命令

npm uninstall -g angular-cli
npm cache clean
npm install -g @angular/cli
npm install