npm -g @angular/cli (11.2) 错误

Question

我正在尝试安装最新版本的 Angular (v11.2)，我得到：-

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@angular/cli@11.2.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@angular-devkit/architect@0.1102.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@angular-devkit/core@11.2.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@angular-devkit/schematics@11.2.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@schematics/angular@11.2.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: '@schematics/update@0.1102.0',
npm WARN EBADENGINE   required: { node: '>= 10.13.0', npm: '^6.11.0', yarn: '>= 1.13.0' },
npm WARN EBADENGINE   current: { node: 'v15.8.0', npm: '7.5.1' }
npm WARN EBADENGINE }

我不明白为什么。

我已将 npm 切换到 v6.11.3 并再次尝试。现在我得到：-

npm WARN npm npm does not support Node.js v15.8.0
npm WARN npm You should probably upgrade to a newer version of node as we
npm WARN npm can't make any promises that npm will work with this version.
npm WARN npm Supported releases of Node.js are the latest release of 6, 8, 9, 10, 11, 12.

这里发生了什么？