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".

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

今天我也遇到了同样的问题，我走过了下面这条路—— (%USERPROFILE%\AppData\Roaming\npm)，当我清除npm目录下的所有内容时，才知道有一些垃圾数据。现在当我运行(npm安装命令再次)。现在一切正常。

如果您在执行上述步骤后仍然得到错误。然后试试下面的建议。

因为它是一个节点脚本。我现在使用下面的选项来创建。

\ users \Administrator\AppData\Roaming\npm\node_modules\angular-cli\bin\ng版本

可能需要符号链接。没有进一步研究。

进一步研究: C:\Users\Administrator\AppData\Roaming\npm;

在Windows中，npm。CMD文件在上述路径下。如果设置了上述环境变量，则可以执行为 ng版本 ng init

这个方法几乎适用于我，但我必须使用:%USERPROFILE%\AppData\Roaming\npm ． 在环境变量中…/ /系统变量的路径

然后当我执行CMD: "ng -v"时，我得到了angular cli的正确响应。

设置路径= % %路径;C: \ \ \ AppData \ \ npm漫游用户