the landlord did the following steps according to other methods:
1angular/cli
2cnpm
3angular/cli
4.npm useless, using cnpm to install also reported an error.
npm installation Times error is as follows:
I hope the boss will give me some advice.
this problem has been resolved. Manually install npm I-g @ angular-devkit/core@0.0.29 @ angular-devkit/core@0.0.29 ajv-keywords@3.2.0
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