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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(3)——更新機制
    時間:2018-07-26 11:18:43
    文章發布:杜凱
    原創作者: special
    來源:微信開發者

    背景

    此前我們有收到開發者的反饋,當小程序發布新版本后,新版本覆蓋率比較慢,尤其是遇到了一些緊急的 BUG時,線上覆蓋速度令人著急。
    為了解決這個問題,我們進行了一些探索,得出了一個解決方案——小程序更新機制,今天和大家分享一下。

    小程序.jpg

    小程序的更新機制

    異步更新機制

    小程序的更新需要經過兩個關鍵的步驟:
    Step1:向微信后臺請求新版本信息;
    Step2:從微信 CDN 下載小程序的代碼包。
    這兩個步驟均需要網絡鏈接,同時這兩個步驟都是單獨進行,并且是強依賴的,即如果沒有新版本信息,就無法確定新版本的下載地址。

    更新檢測與下載流程通常會放在啟動階段進行,小程序平臺也是如此。
    不過小程序的更新流程與啟動流程是同時
    并發執行。
    即使更新信息拉取失敗了,也不會影響小程序的啟動;同時更新也不會影響到小程序的啟動速度。
    但由于小程序的更新流程是異步的,無法在本次啟動就能夠應用上新的版本,如果本次啟動已經下載好新的版本了,需要在下次啟動小程序時才能應用上新版本。

    超過有效時間強制同步更新機制

    為了盡量避免這種更新延遲情況,我們還設計了一個超過有效時間同步檢查更新機制,假如用戶已經超過7天沒有打開過小程序了,這個時候會強制同步拉取新版本信息、下載新版本,并且使用新版本啟動。

    更新機制引起的問題

    超過有效時間同步檢查更新機制能確保到發布版本7天后,絕大部分用戶能用上新的版本,但問題時在 7天之內使用的用戶,可能在第一次啟動時遇到的是異步更新機制,需要在第二次啟動時才能應用新的版本。
    這就導致了一些緊急發布無法在批量檢查更新的 7天內無法覆蓋到絕大部分用戶,對于線上問題來說是很致命的。

    解決這一問題的思路

    為了解決這個問題,我們內部也經歷了數個方案的討論,與大家分享一下我們思考的過程:

    1. 同步檢查更新(放棄)

    可能是直接的解決思路,但這個方案的問題在于會影響小程序的啟動速度,當下小程序的更新迭代是非常頻繁的,部分用戶可能每次啟動都命中更新,如果需要同步檢查更新 + 同步下載新的版本,那將會影響這部分用戶的啟動體驗。

    2. 模塊熱替換(放棄)

    模塊熱替換是指小程序運行起來后,將新版本的 JS 代碼與頁面進行熱替換,使之可以在當前版本上應用上新版本的功能。

    這種方案可以解決異步更新不能在本次啟動馬上應用上的問題,從技術上來說,這也是好的方案,但同時缺點也比較明顯,會存在新舊邏輯、頁面共存問題,對于開發者來說,反而更不好處理,特別是涉及到全局變量時,情況會更復雜。

    但當然這個是我們未來努力的方向。

    3. 縮小定時檢查新版本輪詢時間(目前方案)

    6.6.3 及以上版本的客戶端,會定時 check 近期使用過的小程序是否有發布新版本;如果有,下次冷啟動(指打開非緩存在后臺的小程序)的時候會同步更新新版本再打開。
    這樣可以保證在新版本發布 24 小時后,所有小程序都能使用新版本。
    這部分是微信客戶端自身優化,開發者無需關心。

    4. 異步更新 + 強制更新(目前方案)

    同步檢查更新與模塊熱替換兩者之間的折衷方案,即還是維持異步更新機制,在異步下載完小程序代碼包后,提供重啟小程序的能力,這樣在遇到緊急問題時可以馬上解決,詳請見下文介紹。

    異步更新 + 強制更新方案介紹

    從基礎庫 1.9.90 開始,我們提供了 wx.getUpdateManager 接口,使用該接口,可以獲知是否有新版本小程序、新版本是否下載好以及應用新版本的能力。

    當小程序冷啟動時,會自動向微信后臺請求新版本信息,如果有新版本,會馬上觸發新版本的下載。開發者可以通過 wx.getUpdateManager,獲知當前更新的狀態。

    wx.getUpdateManager 接口會返回一個 UpdateManager 實例,UpdateManager 包含了三個回調:

    1. onCheckForUpdate:當小程序向后臺請求完新版本信息,會通知這個版本告知檢查結果

    2. onUpdateReady當新版本下載完成,會回調這個事件

    3. onUpdateFailed當新版本下載失敗,會回調這個事件

    還有重啟應用新版本的接口:

    1. applyUpdate:當新版本下載完成(onUpdateReady),調用該方法會強制當前小程序應用上新版本并重啟

    具體示例:


    應用場景

    強制更新比較適合緊急修復場景, 可以確保在發布后用戶能馬上用上新版本。
    但是強制更新會中斷用戶的操作,可能會帶來一些不好的體驗。
    對于常規版本更新的場景,應盡量減少使用,或者是只是一個簡單的提醒,由用戶來主動觸發重啟應用操作,即界面上布置一些信息,提供主動觸發重啟更新按鈕給到用戶。

    在強制重啟更新前也建議先通過 showModal 方式咨詢用戶意見,待用戶確認下再進行重啟,實現方式可參考上節示例代碼。


    小程序開發
    標簽: 小程序開發 微信程序開發
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