解决 npm ERR! ENOENT: no such file or directory 错误

在使用 npm 运行 serve 命令时，遇到了以下错误：

PS D:\www> npm run serve
npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path D:\www\package.json
npm ERR! errno -4058
npm ERR! enoent ENOENT: no such file or directory, open 'D:\www\package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\31136\AppData\Local\npm-cache\_logs\2023-10-15T14_44_14_359Z-debug-0.log
PS D:\www>

错误内容： 这个错误是由于npm无法找到'D:\www\package.json'文件所导致的。请确保在'D:\www'目录下存在'package.json'文件，并且路径正确。