2021 Google開發者大會精彩回顧

{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":3}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"今年的Google開發者大會，是不是又給你帶來一次意外驚喜？"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"每年，Google都會在這場年度盛會上爲開發者及科技愛好者展示Google的產品和平臺更新，讓你更快一步瞭解最新產品及洞察最前沿技術。與往年不同的是，今年穀歌首次推出了Google開發者在線課程。2021年11月16日，Google開發者大會以“Develop as One”爲主題，邀請了90多位技術專家爲大家帶來不同領域的技術分享，這些領域包括了移動技術、前端、機器學習以及科技與創新等。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"那麼到底有哪些讓開發者和科技愛好者興奮的更新？來，讓我們一探究竟。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"Android 12 三大關鍵：用戶界面、性能、隱私"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"說到讓開發者興奮的消息， Android功能及版本更新可算的上是一個。從Android 1.0 版本到"},{"type":"text","marks":[{"type":"strong"}],"text":"今年發佈的Android 12"},{"type":"text","text":"，Android每一次的功能升級都讓人們的生活、工作和學習離科技更近一步。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/76\/da\/76b9b30f300ea30be256b89c242722da.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"對用戶來說，沒有什麼會比靈活個性化的用戶界面、高效穩定的性能、強大的隱私保護更讓人興奮了。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"今年，Android 12發佈的設計語言"},{"type":"text","marks":[{"type":"strong"}],"text":" Material You"},{"type":"text","text":"，爲用戶提供了不同風格的個性化體驗，同時還能適配不同尺寸的屏幕和設備，使得用戶界面體驗更升了一級。在Android平臺，系統通過限制應用使用通知trampoline，改善了用戶從通知啓動應用時的延遲問題，更新之後，Google Photos應用的啓動速度加快了34%。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除此之外，強大的隱私保護功能也讓用戶感到欣喜。例如，在支持的設備上新增的"},{"type":"text","marks":[{"type":"strong"}],"text":"“隱私信息中心”"},{"type":"text","text":"向用戶展示過去24小時有哪些應用獲取了設備的麥克風、相機或位置等數據，這讓用戶可以時刻了解隱私信息的使用情況，同時可以輕鬆撤銷應用對這些數據的訪問權限，以保護自己的隱私不受侵犯。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/b8\/b9\/b8eb13b82586b1b4d3b41d07928aefb9.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在這些升級和優化之下，越來越多設備製造商也即將推出搭載Android 12的設備，比如 三星Galaxy、一加、OPPO、Vivo、realme、TECNO和小米。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"而在移動互聯網快速發展的當下，這對開發者來說，要快速、輕鬆打造出用戶體驗良好的應用卻是一項極大的挑戰。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"Android開發工具——助你輕鬆打造用戶體驗良好的應用"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"爲解決越來越多的開發需求，本次Android更新了"},{"type":"text","marks":[{"type":"strong"}],"text":"Jetpack Compose、Modern Android Development（簡稱MAD）"},{"type":"text","text":"等強大的開發工具。它們可以幫助開發者們更快速、簡潔的開發，輕鬆打造優質應用。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Jetpack Compose是用於構建原生Android UI的現代工具包。其穩定的性能，很適合在生產環境中使用。在Google Play裏，有成千上萬個應用都用了Compose，甚至Google Play本身也在使用它。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"如果你是一個初級開發工程師，希望能有更多的時間來寫業務邏輯，而不是花時間在一些動畫、顏色變化等功能上，正如Android Developers官網對它描述的那樣，Jetpack Compose可幫助開發者遵循最佳做法、減少樣板代碼並編寫可在各種Android版本和設備中一致運行的代碼，讓開發者可將精力集中於真正重要的編碼工作上。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在 Compose1.1 中，也包含了一系列性能改進以及新的功能和工具，例如針對Android 12的拉伸滾動來改進觸摸尺寸，以及還在試驗中的佈局動畫等等。在 Android Studio 中，刷新頻率的提高，讓實時編輯可以儘快同步到字面量值。同時，開發者可以在佈局檢查器中查看語義樹。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除此之外，在其他的 Jetpack 庫中，還增加了許多大家建議的新功能，比如導航中引入了對多個返回棧的支持、WorkManager 新增了對加急作業的支持，讓處理 Android 12 後臺限制變得更加簡單、Room 添加了自動遷移和多重映射關聯等。爲了讓 Android 的開發工作變得更簡單、快捷，谷歌還推出了 MAD 開發工具，助力開發者更高效地開發。"}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/31\/51\/319db17ab28684ba87b51bf9fbd37751.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"相信有這些新功能的加持，開發者可以更快、更輕鬆地開發出讓用戶體驗優良的應用。當然，想要提高開發效率、提升用戶體驗，優秀的跨平臺技術也是必不可少的。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"Flutter —— 高效適配多平臺，優化用戶體驗"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Flutter 是谷歌推出的一款開源 的UI 工具包，它可以幫助開發者高效打造優質的"},{"type":"text","marks":[{"type":"strong"}],"text":"跨平臺用戶體驗"},{"type":"text","text":" 。通過Flutter，開發者能夠使用一套代碼，直接將應用編譯爲各個平臺的原生機器碼，包括Android、iOS、Web、桌面等，從而大大提升開發效率，打造更好的用戶體驗。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"從3年前的1.0版本到現在的2.5穩定版本，Flutter已取得了不小的進步和發展。如今Flutter已成爲了一個"},{"type":"text","marks":[{"type":"strong"}],"text":"真正的跨端"},{"type":"text","text":"應用框架。在今年更新的版本中，"},{"type":"text","marks":[{"type":"strong"}],"text":"Flutter的功能擴展到Web、桌面設備以及嵌入式設備"},{"type":"text","text":"。這意味着，對Web的支持進入了穩定版，並隨着CanvasKit渲染器穩定版的推出，Flutter Web應用在桌面瀏覽器中的性能也得到了很大的提升。此外，移動端和Web端在插件方面的差異也在縮小。例如，在面對大家最爲迫切的Web插件需求之一——攝像頭插件，目前Flutter Web也已經支持。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/11\/b9\/11493b2b3311a4f346eb8f9f6742b6b9.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除此之外，"},{"type":"text","marks":[{"type":"strong"}],"text":"DartPad Package 支持 beta 版"},{"type":"text","text":"和 "},{"type":"text","marks":[{"type":"strong"}],"text":"Flutter 版的谷歌移動廣告插件"},{"type":"text","text":"的穩定版的更新也讓開發者的開發變得越來越流暢。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除了前端領域的 Flutter，在機器學習領域的TensorFlow的工具更新，也讓開發者的開發更省時省力。比如Keras 的框架可以讓開發者解決各種各樣的應用機器學習問題，並開發出更復雜的模型。以及TensorFlow Hub 提供的多種多樣的預訓練模型，開發者可用於視頻、圖片、文本、語音和音頻等場景。例如，知衣科技使用 TensorFlow 來訓練他們的模型，構建了3D試衣功能，用戶可以便捷地按圖片來搜索風格類似的衣服。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"而除了能夠快速幫助開發訓練出各種複雜模型之外，很多開發者還深受環境部署之痛。爲了幫助開發者將模型部署到不同設備上，TensorFlow 生態中提供了多項工具，例如TensorFlow Lite，這一針對移動和嵌入式設備的輕量級解決方案就可以構建具備機器學習功能的原生移動應用；TensorFlow.js 不需要環境設置就可以在任何支持JavaScript 的環境中運行模型。此外，"},{"type":"text","marks":[{"type":"strong"}],"text":"TensorFlow.js 已經支持TensorFlow Lite 模型"},{"type":"text","text":"，可以更加高效且便捷地助力開發者們在Web 環境中高效開發。"}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/ab\/a3\/abdce233937ab2a58746179884f7f8a3.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"另外，在TensorFlow 爲開發者打造的"},{"type":"text","marks":[{"type":"strong"}],"text":"TensorFlow決策森林"},{"type":"text","text":" (TensorFlow Decision Forests, TF-DF) 中，豐富的工具和模型讓開發者也可以輕鬆地跟 TensorFlow 工具、庫以及 TFX 等平臺組合使用。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/4b\/4f\/4b08ff93dbb86b41874696a0fc1d7e4f.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在實踐上，"},{"type":"text","marks":[{"type":"strong"}],"text":"TensorFlow Recommenders"},{"type":"text","text":" 能幫助開發者構建可靠、強大的推薦系統，包括基於TensorFlow Recommenders 的 DLRM 模型和與 TensorFlow Ranking 的集成功能。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"技術遠不止於此，谷歌還可以讓技術更好玩。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"ARCore By Google —— 體驗創意無限"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"如今，AR已不再只是一個吸引眼球的科技名詞，越來越多的AR精彩體驗已走進我們的日常生活，改變了我們學習、購物以及出行方式。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"目前，全球已有超過10億部ARCore認證的設備，國內五大品牌的智能手機也支持了ARCore技術；開發者可以在Android上直接開發AR應用或使用Unity和WebXR。本次大會中也提到了不少ARCore的更新亮點，例如在"},{"type":"text","marks":[{"type":"strong"}],"text":"深度Depth API "},{"type":"text","text":"中增強的真實感和精確度，讓超過3.8億的Android設備都能夠實時生成深度圖。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"ARCore Depth 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Cloud、Google Play、Wear OS by Google、Material Design、移動應用全球化、谷歌藝術與文化、多元，平等和共融等共18條技術產品線的更新。超900分鐘、70+技術的在線演講，除了在2021 Google開發者大會官方網站，在谷歌本次合作的媒體InfoQ官方平臺上也可縱情觀看。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除此之外，爲了更好地幫助每一個開發者學習新技能和重要技能，谷歌在今年首次推出了"},{"type":"text","marks":[{"type":"strong"}],"text":"Google開發者在線課程"},{"type":"text","text":"。本在線課程由谷歌產品團隊精心打造，包括80多篇文章和110多個視頻深度解析、170多個引導式編程練習，覆蓋10+項Google產品或服務，是中文、免費的在線課程。豐富的專業乾貨，不僅可以讓開發者深入學習某項技能，還可以讓國內的開發者們更好地瞭解如何使用Google產品或服務進行開發，爲自己的自身發展與職業發展贏得先機。"}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/e1\/2c\/e19b7e1c41bb0d9563cc0b21bae6732c.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"攜手企業夥伴共建用戶體驗優先的全球生態系統"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在致力於幫助中國開發者的同時，谷歌也助力中國的公司和企業走向全球。其中，在以“ Develop as One” 爲主題的線上交流座談會中，谷歌共邀了WPS、塗鴉智能、閱文，分享了他們在海外市場的戰略，以及谷歌是如何幫助他們在海外市場上取得成功的創新與經驗。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"金山辦公海外業務總經理吳增諗指出，從海外市場策略，Google Play分發，到產品優化及商業運營，金山辦公都與Google有密切的合作。Google的週期性會議所提供的表現洞察，讓金山辦公從多維度提升了產品體驗，從而促進了用戶增長及進一步運營優化。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"閱文集團海外業務負責人陳姍姍分享到，閱文集團從中國市場出發，向更廣闊的海外市場拓展，在Google的支持下，商業模式也在海外市場做出了針對性的調整，發展越來越快。比如閱文應用了Google Play的Freemium功能來創新商業模式——即用戶先看內容再付費推而廣之，取代了之前海外市場主流的Premium即先付費後獲取內容，更好地滿足了海外內容用戶的需求。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"塗鴉科技智能聯合創始人兼COO楊懿也分享到，塗鴉藉助Google Assistant在搜索和機器學習領域的優勢，幫助許多合作客戶完成產品智能化，成功開拓了全球語音市場。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"除此之外，Google還聯合了羅蘭貝格和大觀資本發佈了《2021移動應用全球化指南》，從而協助中國移動應用開發者成功出海、制勝未來。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"image","attrs":{"src":"https:\/\/static001.infoq.cn\/resource\/image\/cc\/14\/cc74eb5a9d437cf40b50e69ceb1daa14.png","alt":null,"title":"","style":[{"key":"width","value":"75%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"總結："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"細觀往屆，每一屆Google開發者大會都會給開發者帶來無限的驚喜。Google一直致力於爲開發者提供支持，助力他們打造面向當今和未來的出色產品。無論是使用Android 12開發大屏應用，使用TensorFlow部署機器學習模型，還是利用ARCore構建全新的增強現實體驗，都讓開發者的開發工作變得更高效、更容易。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"從本次Google開發者大會的主題是“Develop as One ”，也可以看的出，谷歌希望匯聚開發者合力，共創機遇，共謀發展，繼續以豐富多元的技術產品與平臺，攜手中國開發者和企業共同建設美好社區的決心。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":" "}]}]}