使用angular框架执行ng build报错：

`PS D:\桌面\Theme> ng build` `An unhandled exception occurred: Cannot find module '@angular-devkit/build-angular/package.json'` `Require stack:` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\node-modules-architect-host.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\node\index.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\models\architect-command.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\commands\build-impl.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\export-ref.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\tools\index.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\utilities\json-schema.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\models\command-runner.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\lib\cli\index.js` ` C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\lib\init.js` `C:\Users\admin\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng` `See "C:\Users\admin\AppData\Local\Temp\ng-LIt5Bj\angular-errors.log" for further details.'`

解决方法：

工程根目录下执行 `npm i --save-dev @angular-devkit/build-angular`