用nvm安装node后，发现npm下载总是失败的解决办法

执行安装命令如下出现npm下载失败，尝试多次都不成功：

C:\windows\system32>nvm install 14.17.3
Downloading node.js version 14.17.3 (64-bit)...
Complete
Downloading npm version 6.14.13... Error while downloading https://github.com/npm/cli/archive/v6.14.13.zip - Get "https://github.com/npm/cli/archive/v6.14.13.zip": dial tcp 20.205.243.166:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x20 pc=0x469b27]

goroutine 1 [running]:
nvm/web.Download({0x118b4030, 0x2f}, {0x118b4060, 0x2a}, {0x11992970, 0x7})
        C:/Users/corey/OneDrive/Documents/workspace/oss/coreybutler/nvm-windows/src/web/web.go:81 +0x297
nvm/web.GetNpm({0x1180c679, 0x14}, {0x11992970, 0x7})
        C:/Users/corey/OneDrive/Documents/workspace/oss/coreybutler/nvm-windows/src/web/web.go:209 +0x379
main.install({0x118120b8, 0x7}, {0x4cfa65, 0x2})
        C:/Users/corey/OneDrive/Documents/workspace/oss/coreybutler/nvm-windows/src/nvm.go:356 +0xa8a
main.main()
        C:/Users/corey/OneDrive/Documents/workspace/oss/coreybutler/nvm-windows/src/nvm.go:87 +0xa69

解决方法：

可从npm网站(https://registry.npmmirror.com/binary.html?path=npm/)(若此网站没有对应版本也可以在https://github.com/npm/cli/releases下载)下载对应的npm包。之后解压，将解压后的文件名改成npm，复制到对应的node版本文件夹下的node_moudles文件夹下。如下图，我用mvm安装的是node14.17.3版本，node文件名为v14.17.3，我将重命名的npm文件放到了nvm/v14.17.3/node_moudles里。

然后将nvm/v14.17.3/node_moudles/npm/bin文件夹里的下图红框中的文件，复制到node文件夹下。

这里我的node的文件名是v14.17.3，所以我复制到了v14.17.3文件下，如下图。