Angular 7 安装引导程序答案

【问题标题】：Angular 7 installing bootstrapAngular 7 安装引导程序
【发布时间】：2019-06-27 18:35:27
【问题描述】：

我正在关注应该与 Angular 7 一起使用的“Pro Angular 6”一书。我是这样开始项目的；

安装 Angular cli

sudo npm install -g @angular/cli

注意：这里安装了 cli 工具的 7.3.0 版

现在安装 TODO 应用

ng new todo
cd todo
ng serve --port 3001 --open

这行得通，然后我添加引导程序

npm install bootstrap@4.1.1

我将以下内容添加到样式中

        "styles": [
          "src/styles.css",
          "node_modules/bootstrap/dist/css/bootstrap.min.css"
        ],

现在，当我为项目提供服务时，出现以下错误；

$ ng serve --port 3001 --open
** Angular Live Development Server is listening on localhost:3001, open your browser on http://localhost:3001/ **

Date: 2019-02-04T00:42:38.279Z
Hash: 3b3bf9a4d6733eee0b6c
Time: 5466ms
chunk {es2015-polyfills} es2015-polyfills.js, es2015-polyfills.js.map (es2015-polyfills) 5.07 kB [initial] [rendered]
chunk {main} main.js, main.js.map (main) 1.88 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 2.09 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.08 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 1.03 MB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 327 kB [initial] [rendered]

ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/array' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/date' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/function' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/map' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/math' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/number' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/object' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/parse-float' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/parse-int' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-jit-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/reflect' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/regexp' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/set' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/string' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/symbol' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/es2015-polyfills.js
Module not found: Error: Can't resolve 'core-js/es6/weak-map' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in ./node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/jit-polyfills.js
Module not found: Error: Can't resolve 'core-js/es7/reflect' in '/home/map7/code/pro_angular_6/chap2_prep/todo/node_modules/@angular-devkit/build-angular/src/angular-cli-files/models'
ERROR in node_modules/@angular/common/src/location/location.d.ts(8,34): error TS2307: Cannot find module 'rxjs'.
node_modules/@angular/common/src/pipes/async_pipe.d.ts(9,28): error TS2307: Cannot find module 'rxjs'.
node_modules/@angular/core/src/application_ref.d.ts(8,28): error TS2307: Cannot find module 'rxjs'.
node_modules/@angular/core/src/event_emitter.d.ts(8,39): error TS2307: Cannot find module 'rxjs'.
node_modules/@angular/core/src/linker/query_list.d.ts(8,28): error TS2307: Cannot find module 'rxjs'.
node_modules/@angular/core/src/util/lang.d.ts(8,28): error TS2307: Cannot find module 'rxjs'.
src/app/app.component.ts(3,1): error TS2354: This syntax requires an imported helper but module 'tslib' cannot be found.

ℹ ｢wdm｣: Failed to compile.

【问题讨论】：

我试图复制这个问题，但似乎一切正常。删除引导 css 时是否编译？我尝试使用：Angular CLI：7.3.0 节点：8.11.3 操作系统：win32 x64 引导程序：^4.1.1 添加了样式：node_modules/bootstrap/dist/css/bootstrap.min.css
我刚刚删除了 node_modules 并执行了“npm install”，然后一切都变得生动起来。不知道为什么这会改变我认为 ng new 会完成 npm 安装的事情
确保你有 @angular-devkit/build-angular 作为开发依赖。
@RamChandraNeupane 你是对的 @angular-devkit/build-angular 缺失
@Dexter 太好了，如果有人遇到同样的问题，我会在这里发布答案

标签： angular bootstrap-4 angular-cli

【解决方案1】：

我相信您需要将@angular-devkit/build-angular 安装为dev dependencies 才能解决此问题

npm install --save-dev @angular-devkit/build-angular

【讨论】：

【解决方案2】：

您必须在安装过程中添加--save，以便 Angular 在 package.json 中添加此依赖项。试试下面的代码。

npm install bootstrap@4.1.1 --save

【讨论】：