代码重构

是否单一出口原则

const headerKeys = ['sdp-app-id', 'sdp-biz-type', 'sdp-org-id', 'Accept-Language']
  const alias = {
    'sdp-app-id': ['appId', '__app_id'],
    'Accept-Language': ['language', 'lang', 'locale', '__lang']
  }
  const headers = {}
  // 初始化 从 url localStorage window.SDP_APP_DATA cookie 浏览器 中取值
  const searchParams = parse(window.location.search)
  const hashParams = parse(window.location.hash.replace(/^#[^?]+/, ''))
  const db = JSON.parse(localStorage.getItem('SDP_APP_DATA') || '{}')
  const global = window.SDP_APP_DATA || {}
  const dataSources = [searchParams, hashParams, db, global]
  dataSources.forEach((data) => {
    headerKeys.forEach((key) => {
      if (!headers[key]) {
        if (data[key]) {
          headers[key] = data[key]
        } else {
          const aliasKeys = alias[key] || []
          aliasKeys.some((aliasKey) => {
            const value = data[aliasKey]
            if (value) {
              headers[key] = value
              return true
            }
            return false
          })
        }
      }
    })
  })

headerKeys.forEach((key) => {
  if (headers[key]) return
  dataSources.forEach((data) => {
    if (data[key]) return headers[key] = data[key]
    if (!alias[key]) return
    alias[key].forEach((aliasKey) => {
      const value = data[aliasKey]
      if (value) {
        headers[key] = value
      }
    })
  })
})