Question

我刚开始学习Angular，我下载了最新版本的node js并安装了angular cli。然后我开始研究一个项目，发现我需要Angular 4，而我开始使用Angular 5

"dependencies": {
"@angular/animations": "^5.0.0",
"@angular/common": "^5.0.0",
"@angular/compiler": "^5.0.0",
"@angular/core": "^5.0.0",
"@angular/forms": "^5.0.0",
"@angular/http": "^5.0.0",
"@angular/platform-browser": "^5.0.0",
"@angular/platform-browser-dynamic": "^5.0.0",
"@angular/router": "^5.0.0",
"bootstrap": "^3.3.7",
"core-js": "^2.4.1",
"rxjs": "^5.5.2",
"zone.js": "^0.8.14"
},

有没有办法在不重新启动项目的情况下迁移回来？有没有办法指定在使用ng new创建项目时使用哪个版本的Angular？

Answer 1

你为什么要降级？您的项目是全新的，为什么不使用最新版本？

如果您想降级，只需将package.json中的版本替换为您想要的版本即可。

这看起来像

"dependencies": {
  "@angular/animations": "^4.3.1",
  "@angular/common": "^4.3.1",
  "@angular/compiler": "^4.3.1",
  "@angular/core": "^4.3.1",
  "@angular/forms": "^4.3.1",
  "@angular/http": "^4.3.1",
  "@angular/platform-browser": "^4.3.1",
  "@angular/platform-browser-dynamic": "^4.3.1",
  "@angular/router": "^4.3.1",
  "bootstrap": "^3.3.7",
  "core-js": "^2.4.1",
  "rxjs": "^5.5.2",
  "zone.js": "^0.8.14"
},

只需保留miind，您还需要设置所有依赖项的版本，但您的控制台会告诉您，不要担心。

Answer 2

对package.json使用以下代码：

  "dependencies": {
    "@angular/animations": "^4.4.6",
    "@angular/common": "^4.4.6",
    "@angular/compiler": "^4.4.6",
    "@angular/core": "^4.4.6",
    "@angular/forms": "^4.4.6",
    "@angular/http": "^4.4.6",
    "@angular/platform-browser": "^4.4.6",
    "@angular/platform-browser-dynamic": "^4.4.6",
    "@angular/router": "^4.4.6",
    "rxjs": "^5.4.2"
  },
  "devDependencies": {
    "@angular/cli": "1.4.9",
    "@angular/compiler-cli": "^4.4.6",
  }

在terminal / command-prompt上运行npm install并运行您的项目。现在你正在运行angular 4项目。希望它会有所帮助。

如何从角度5迁移到4

2 个答案: