执行以下几行，以解决ng未找到和未定义版本的问题

卸载-g angular-cli

卸载angular-cli

NPM缓存清理

安装-g @angular/cli@latest

我也遵循这个问题，所以我尝试了这个命令，它工作得很好。 使用命令:npm run ng

我根据图解决了这个问题:

在CMD下运行

 npm install -g @angular/cli

然后

(在Windows 10中打开)控制面板\所有控制面板项\系统 或按图

步骤1:

第二步:

步骤3:

目的:

添加缺少的ng路径

下面是你需要添加的新环境变量:c:\ users \ pk\ appdata \漫游\npm\node_modules\@angular\cli\bin

最后，重新启动所有打开的命令提示符并重试。

关闭CMD并再次以管理员权限打开或重新启动系统。

将C:\Users\DELL\AppData\Roaming\npm添加到系统变量路径对我来说很有效。请找到相应的“npm”文件路径

另外，检查是否已经将angular-cli\bin路径添加到path变量中。

I was having the same issue when tried with the syntax "ng new " and solved that simply by updating the existing node version from 5.x.x to 8.x.x. After successful updation of node, the syntax worked perfectly for me. Please update the existing version of node. As it is clearly mentioned in angular documentation that these commands require the node version >= 6.9.x. For reference please check https://angular.io/guide/quickstart. It clearly states "Verify that you are running at least node 6.9.x and npm 3.x.x by running node -v and npm -v in a terminal/console window. Older versions produce errors, but newer versions are fine".