1、下载/创建一个nvmInstall.sh脚本

#!/usr/bin/env bash

{ # this ensures the entire script is downloaded #

nvm_has() {
  type "$1" > /dev/null 2>&1
}

nvm_echo() {
  command printf %s\\n "$*" 2>/dev/null
}

nvm_grep() {
  GREP_OPTIONS='' command grep "$@"
}

nvm_default_install_dir() {
  [ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm"
}

nvm_install_dir() {
  if [ -n "$NVM_DIR" ]; then
    printf %s "${NVM_DIR}"
  else
    nvm_default_install_dir
  fi
}

nvm_latest_version() {
  nvm_echo "v0.38.0"
}

nvm_profile_is_bash_or_zsh() {
  local TEST_PROFILE
  TEST_PROFILE="${1-}"
  case "${TEST_PROFILE-}" in
    *"/.bashrc" | *"/.bash_profile" | *"/.zshrc")
      return
    ;;
    *)
      return 1
    ;;
  esac
}

#
# Outputs the location to NVM depending on:
# * The availability of $NVM_SOURCE
# * The method used ("script" or "git" in the script, defaults to "git")
# NVM_SOURCE always takes precedence unless the method is "script-nvm-exec"
#
nvm_source() {
  local NVM_GITHUB_REPO
  NVM_GITHUB_REPO="${NVM_INSTALL_GITHUB_REPO:-nvm-sh/nvm}"
  local NVM_VERSION
  NVM_VERSION="${NVM_INSTALL_VERSION:-$(nvm_latest_version)}"
  local NVM_METHOD
  NVM_METHOD="$1"
  local NVM_SOURCE_URL
  NVM_SOURCE_URL="$NVM_SOURCE"
  if [ "_$NVM_METHOD" = "_script-nvm-exec" ]; then
    NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/nvm-exec"
  elif [ "_$NVM_METHOD" = "_script-nvm-bash-completion" ]; then
    NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/bash_completion"
  elif [ -z "$NVM_SOURCE_URL" ]; then
    if [ "_$NVM_METHOD" = "_script" ]; then
      NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/nvm.sh"
    elif [ "_$NVM_METHOD" = "_git" ] || [ -z "$NVM_METHOD" ]; then
      NVM_SOURCE_URL="https://github.com/${NVM_GITHUB_REPO}.git"
    else
      nvm_echo >&2 "Unexpected value \"$NVM_METHOD\" for \$NVM_METHOD"
      return 1
    fi
  fi
  nvm_echo "$NVM_SOURCE_URL"
}

#
# Node.js version to install
#
nvm_node_version() {
  nvm_echo "$NODE_VERSION"
}

nvm_download() {
  if nvm_has "curl"; then
    curl --fail --compressed -q "$@"
  elif nvm_has "wget"; then
    # Emulate curl with wget
    ARGS=$(nvm_echo "$@" | command sed -e 's/--progress-bar /--progress=bar /' \
                            -e 's/--compressed //' \
                            -e 's/--fail //' \
                            -e 's/-L //' \
                            -e 's/-I /--server-response /' \
                            -e 's/-s /-q /' \
                            -e 's/-sS /-nv /' \
                            -e 's/-o /-O /' \
                            -e 's/-C - /-c /')
    # shellcheck disable=SC2086
    eval wget $ARGS
  fi
}

install_nvm_from_git() {
  local INSTALL_DIR
  INSTALL_DIR="$(nvm_install_dir)"
  local NVM_VERSION
  NVM_VERSION="${NVM_INSTALL_VERSION:-$(nvm_latest_version)}"
  if [ -n "${NVM_INSTALL_VERSION:-}" ]; then
    # Check if version is an existing ref
    if command git ls-remote "$(nvm_source "git")" "$NVM_VERSION" |