Cannot find module 'angular-in-memory-web-api'

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在《Angular官方教程第七课HTTP》调试示例出现Cannot find module 'angular-in-memory-web-api'

分析问题

估计是缺少angular-in-memory-web-api依赖包，到工程根目录下的node_modules文件夹下去寻找angular-in-memory-web-api没有找到。

解决问题

查看工程根目录下的package.json，没有添加angular-in-memory-web-api，于是在”dependencies”下添加"angular-in-memory-web-api": "^0.3.2"

{  "name": "angular-tour-of-heroes",  "version": "0.0.0",  "license": "MIT",  "scripts": {    "ng": "ng",    "start": "ng serve",    "build": "ng build",    "test": "ng test",    "lint": "ng lint",    "e2e": "ng e2e"  },  "private": true,  "dependencies": {    "@angular/animations": "^4.0.0",    "@angular/common": "^4.0.0",    "@angular/compiler": "^4.0.0",    "@angular/core": "^4.0.0",    "@angular/forms": "^4.0.0",    "@angular/http": "^4.0.0",    "@angular/platform-browser": "^4.0.0",    "@angular/platform-browser-dynamic": "^4.0.0",    "@angular/router": "^4.0.0",    "core-js": "^2.4.1",    "rxjs": "^5.1.0",    "zone.js": "^0.8.4",  },  "devDependencies": {    "@angular/cli": "1.1.1",    "@angular/compiler-cli": "^4.0.0",    "@angular/language-service": "^4.0.0",    "@types/jasmine": "2.5.45",    "@types/node": "~6.0.60",    "codelyzer": "~3.0.1",    "jasmine-core": "~2.6.2",    "jasmine-spec-reporter": "~4.1.0",    "karma": "~1.7.0",    "karma-chrome-launcher": "~2.1.1",    "karma-cli": "~1.0.1",    "karma-jasmine": "~1.1.0",    "karma-jasmine-html-reporter": "^0.2.2",    "karma-coverage-istanbul-reporter": "^1.2.1",    "protractor": "~5.1.2",    "ts-node": "~3.0.4",    "tslint": "~5.3.2",    "typescript": "~2.3.3"  }}

然后在项目根目录下执行cnpm install安装angular-in-memory-web-api依赖。
然后重新执行npm start。

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