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    當前位置: 首頁 > 售后 > 藝源智庫
    【小程序】小程序?小故事(4)——獲取用戶信息
    時間:2018-07-26 11:30:45
    文章發布:杜凱
    原創作者:胡浩
    來源:微信開發者

    背景

    我們發現大部分小程序都會使用 wx.getUserInfo 接口,來獲取用戶信息。原本設計這個接口時,我們希望開發者在真正需要用戶信息的情況下才去調取這個接口,但很多開發者會直接調用這個接口,導致用戶在使用小程序的時候產生困擾,歸結起來有幾點:

    小程序.jpg

    • 開發者在小程序首頁直接調用 wx.getUserInfo 進行授權,彈框獲取用戶信息,會使得一部分用戶點擊“拒絕”按鈕。

    • 在開發者沒有處理用戶拒絕彈框的情況下,用戶必須授權頭像昵稱等信息才能繼續使用小程序,會導致某些用戶放棄使用該小程序。

    • 用戶沒有很好的方式重新授權,盡管我們增加了設置頁面,可以讓用戶選擇重新授權,但很多用戶并不知道可以這么操作。

    此外,我們發現開發者默認將 wx.login  wx.getUserInfo 綁定使用,這個是由于我們一開始的設計缺陷和實例代碼導致的(wx.getUserInfo 必須通過 wx.login 在后臺生成 session_key后才能調用)。同時,我們收到開發者的反饋,希望用戶進入小程序首頁便能獲取到用戶的 unionId,以便識別到用戶是否以前關注了同主體公眾號或使用過同主體的App 。

    為了解決以上問題,針對獲取用戶信息我們更新了三個能力:

    1.使用組件來獲取用戶信息

    2.若用戶滿足一定條件,則可以wx.login 獲取到的code直接換到unionId

    3.wx.getUserInfo 不需要依賴 wx.login 就能調用得到數據

    獲取用戶信息組件介紹

     組件變化:

    • open-type 屬性增加 getUserInfo :用戶點擊時候會 bindgetuserinfo 事件。

    • 新增事件 bindgetuserinfo :當 open-type getUserInfo 時,用戶點擊會觸發??梢詮氖录祷貐档?/span> detail 字段中獲取到和 wx.getUserInfo 返回參數相同的數據。

    示例:

     Click me

     wx.getUserInfo 不同之處在于:

    1.API wx.getUserInfo 只會彈一次框,用戶拒絕授權之后,再次調用將不會彈框;

    2.組件由于是用戶主動觸發,不受彈框次數限制,只要用戶沒有授權,都會再次彈框。

    通過獲取用戶信息的組件,就可以解決用戶再次授權的問題。

    直接獲取unionId

    開發者申請 userinfo 授權主要為了獲取 unionid,我們鼓勵開發者在不騷擾用戶的情況下合理獲得unionid,而僅在必要時才向用戶彈窗申請使用昵稱頭像。為此,凡使用“獲取用戶信息組件”獲取用戶昵稱頭像的小程序,在滿足以下全部條件時,將可以靜默獲得 unionid

    1.在微信開放平臺下存在同主體的App、公眾號、小程序。

    2.用戶關注了某個相同主體公眾號,或曾經在某個相同主體App、公眾號上進行過微信登錄授權。


    這樣可讓其他同主體的App、公眾號、小程序的開發者快速獲得已有用戶的數據。

    不依賴登錄的用戶信息獲取

    某些工具類的輕量小程序不需要登錄行為,但是也想獲取用戶信息,那么就可以在 wx.getUserInfo 的時候加一個參數 withCredentials: false 直接獲取到用戶信息,可以少一次網絡請求。

    這樣可以在不給用戶彈窗授權的情況下直接展示用戶的信息。

    合適的實踐

    1.調用 wx.login 獲取 code,然后從微信后端換取到 session_key,用于解密 getUserInfo返回的敏感數據。

    2.使用 wx.getSetting 獲取用戶的授權情況
      1) 如果用戶已經授權,直接調用 API wx.getUserInfo 獲取用戶新的信息;
      2) 用戶未授權,在界面中顯示一個按鈕提示用戶登入,當用戶點擊并授權后就獲取到用戶的新信息。

    3.獲取到用戶數據后可以進行展示或者發送給自己的后端。


    One More Thing

    除了獲取用戶方案介紹之外,再聊一聊很多初次接觸微信小程序的開發者所不容易理解的一些概念:

    1.關于OpenId和UnionId

    OpenId 是一個用戶對于一個小程序/公眾號的標識,開發者可以通過這個標識識別出用戶。

    UnionId 是一個用戶對于同主體微信小程序/公眾號/APP的標識,開發者需要在微信開放平臺下綁定相同賬號的主體。開發者可通過UnionId,實現多個小程序、公眾號、甚至APP 之間的數據互通了。

    同一個用戶的這兩個 ID 對于同一個小程序來說是永久不變的,就算用戶刪了小程序,下次用戶進入小程序,開發者依舊可以通過后臺的記錄標識出來。

    2.關于 getUserInfo 和 login

    很多開發者會把 login 和 getUserInfo 捆綁調用當成登錄使用,其實 login 已經可以完成登錄,getUserInfo 只是獲取額外的用戶信息。

     login 獲取到 code 后,會發送到開發者后端,開發者后端通過接口去微信后端換取到 openid 和sessionKey(現在會將 <code style="margin: 0px 4px 0

    小程序開發
    標簽: 小程序開發
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