将新路径设置为c:\ users \你的名字\ appdata \漫游\npm\node_modules\@angular\cli\bin\ng现在对我来说很好

对我来说，PATH环境变量有问题。我删除了所有与npm相关的路径，并在path的开头添加了这个文件夹:

c:\Users\<your-user-name>\AppData\Roaming\npm\

确保你有;之间的路径。

您可以这样办理登机手续。我也有同样的问题。首先，在环境变量中检查用户PATH。它必须指向%USERPROFILE%\AppData\Roaming\npm\node_modules\@angular\cli\

使用node.js命令提示符代替命令提示符。在安装的程序菜单中运行node.js命令提示符。点击开始，搜索node.js命令提示符。运行它，然后输入ng -v回车。它会起作用的。如果有帮助，请告诉我。

通过命令

npm install -g @angular/cli@latest

它工作得很好，我现在能够运行ng命令了。

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".

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。