if (!openId) { // 内存内没有openid
  let locationUrl = window.location.href
  // 检测是否参数内有code，若有则跳接口获取openid，若没有则跳授权页
  if (locationUrl.indexOf('code') >= 0) { // 链接里有code
    let url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' + appid + '&secret=' + secret + '&code=' + code + '&grant_type=authorization_code'
    let result = JSON.parse(window.location.href = url)
    openId = result.openId
    if (openId) {
      localStorage.setItem('openId', openId)
      getUserInfoByOpenId(openId)
    }
  } else { // 链接里没有code
    let codeUri = encodeURIComponent(href)
    let url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=' + appid + '&redirect_uri=' + codeUri + '&response_type=code&scope=' + scope + '&state=123#wechat_redirect'
    window.location.href = url
  }