/ Installing packages...npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3
with 15x less dependencies.
npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm ERR! Unexpected end of JSON input while parsing near '...1eyzg1c6C5x9zUb1lEw42'
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Dell\AppData\Roaming\npm-cache\_logs\2020-08-23T06_56_43_955Z-debug.log
× Package install failed, see above.
The Schematic workflow failed. See above.
答案 0 :(得分：0)
此问题有时与Angular CLI的安装不完整或升级时缺少下载有关。
在清洁CLI之后，尝试重新安装npm cache。
npm uninstall -g @angular/cli
npm cache clean --force
npm install -g @angular/cli