通过授权的方式获取code，传给后端换取getBrandWCPayRequest调起支付所需的参数，因为location.replace跳转到OAuth2网页授权登陆的原因，会造成ios微信底部出现forward/back按钮，影响ui

isWeChat() {
  return /MicroMessenger/i.test(navigator.userAgent);
},
getWeChatCode() {
  if (this.isWeChat()) {
    const appId = 'xxxxxxxxxxxx'
    const redirectUri = encodeURIComponent(window.location.href)
    uni.setStorageSync('redirectUri', window.location.href)
    const scope = 'snsapi_base'
    const state = 'STATE123'
    window.location.replace(`https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appId}&redirect_uri=${redirectUri}&response_type=code&scope=${scope}&state=${state}#wechat_redirect`)
  } else {
    this.$tip.confirm('需要在微信环境下才能使用', false)
  }
},
checkWeChatCode() {
  let code = this.getUrlCode('code')
  if (code) {
    let params = {
      user_id: uni.getStorageSync('userId'),
      code: code,
      package_id: uni.getStorageSync('packageId'),
    }
    this.$http.post('/package/buy', params).then(res => {
      if (res.status === 'success') {
        let self = this
        window.WeixinJSBridge.invoke('getBrandWCPayRequest', res.data, function (result) {
          if (result.err_msg === "get_brand_wcpay_request:ok") {
            self.$tip.confirm('支付成功', false).then(() => {
              self.queryInfo()
            })
          } else if (result.err_msg === "get_brand_wcpay_request:cancel") {
            self.$tip.confirm('已取消支付', false)
          } else {
            self.$tip.confirm('支付失败', false)
          }
        });
      } else {
        this.$tip.confirm(res.message, false);
      }
    })
  }
},