我在x86的windows 7上也遇到了同样的问题;

卸载@angular / cli 安装@angular / cli 检查和验证环境变量(没有问题)… 同样的问题:

解决方案是C:\Users{USERNAME} .npmrc文件…将前缀改为"prefix=${APPDATA}\npm"…感谢这个网站的帮助，解决这个问题

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

NPM install -g @angular/cli代替了NPM install @angular/cli

在我的情况下，我做了以下步骤。

所有程序-> Node JS->右键单击Node. JS命令提示符，选择属性和从目标字符串在结束复制下面

/k "C:\Program Files\nodejs\nodevars.bat"

我启动Visual Studio Code并打开下面的文件

C:\Users\gochinta\AppData\Roaming\Code\User\settings.Json，并给出如下

// Place your settings in this file to overwrite the default settings
{
  "terminal.integrated.shellArgs.windows": 
  ["/k", "C:\\Program Files\\nodejs\\nodevars.bat"]

}

现在我在Visual Studio Code终端窗口中输入ng -v，它工作了。

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".

在系统env设置中，将node_modules下的.bin文件夹中的ng命令路径添加到path变量。

例:将C:\testProject\node_modules\.bin\添加到PATH中

重新启动IDE。