// 拉取git仓库指定分支代码
def call (Map config = [:]) {
  echo "--> 拉取代码开始"
  def branch = config.branch
  def url = config.url
  def credentialId = config.credentialId
  checkout([
    $class: 'GitSCM', 
    branches: [[name: "*/${branch}"]], 
    doGenerateSubmoduleConfigurations: false, 
    extensions: [], 
    submoduleCfg: [], 
    userRemoteConfigs: [[
      url: "${url}", 
      credentialsId: "${credentialId}"
    ]]
  ])
  echo "--> 拉取代码成功"
}