使用npm -v时报错Class extends value undefined is not a constructor or null

卸载旧的node.js是没有卸载干净

TypeError: Class extends value undefined is not a constructor or null
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\socks-proxy-agent\dist\agent.js:114:44)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\socks-proxy-agent\dist\index.js:5:33)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\lib\agent.js:169:25)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
TypeError: Class extends value undefined is not a constructor or null
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\socks-proxy-agent\dist\agent.js:114:44)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\socks-proxy-agent\dist\index.js:5:33)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (D:\Program Files\nodejs\node_modules\npm\node_modules\make-fetch-happen\lib\agent.js:169:25)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)

解决办法：

1.先将目前的node.js卸载；然后把node.js路径下的node_modules文件夹删掉，

2.重新安装node.js安装包

就可以啦