[Old] TP TW FED
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    ###### tags: `information` # FED Interview Question # Open Question (根據面試者履歷來挑題目) * 有沒有在參加技術的社群?有參與發表的經驗嗎? * 哪一類型?視覺或工程亦或兩者兼具? * 曾經解決過最有挑戰的問題? * 有跨團隊或是跨國的溝通經驗嗎? * 為何要離開現任公司? * 對趨勢科技的了解? * 你過去一年有發展或學習什麼新的技術嗎? * 你認為前端工程師的定位是什麼,你自己怎麼定位你自己?你認為前端的價值是什麼? # Technical Question ## 實務題 (根據面試者履歷來挑題目) * 怎麼做 refactor? 如何確保正確性 / refactor流程 * 從哪些方面去評估系統是否符合效能需求、performance 是否夠穩定、夠好 * 你有 code review 的經驗嗎?如果今天發一個 PR 給你,你會如何下手? * 有在專案中找出可以改善的地方並且實作嗎?從中學到什麼? * 有寫過UI Testing(unit test, e2e test)的經驗嗎?可以簡單分享一下嗎? * 有css preprocessor或CSS In JS (glamor, style-component)之類的經驗嗎? * 有用過 JWT 嗎?請解釋一下他的運作流程 * 如何在多人合作的專案確保大家程式碼有一定的品質? * 能使用技術面的方式嗎? ## HTML ### Junior * cookies, session, sessionStorage 和 localStorage 的不同? * 知道Semantic HTML是什麼嗎? * 什麼是client render? 什麼是server side render?各別的好處與壞處 * 何謂Restful API? * 什麼是ajax? * 什麼是SPA? * 如何实现浏览器内多个标签页之间的通信? ### Senior * CSRF Cross-site request forgery * 知道什麼是Critical Rendering Path嗎? * Render Tree, DOM Tree and CSSOM Tree 三者關係? * https://cythilya.github.io/2018/07/13/critical-rendering-path/ ## CSS ### Junior * 列舉css垂直置中的方法,能講多少是多少? * 什麼是RWD?RWD怎麼實作? * Mobile First 是什麼? * 可以解釋一下什麼是Box Model? * position relative、fixed、absolute 和 static 的差異性? * 請介紹 pseudo classes,他的用處是什麼? * 知道flexbox嗎?知道的話,可以大概介紹一下嗎? ### Senior * 請解釋 Reflow, Repaint * 使用js更改元素的width,請問他走過的流程? * 說出三種減少reflow的方法 * 為何現在都不建議使用 table 來排版,他跟render的關係在哪? * 請介紹 pseudo element,他的用處是什麼,他會有什麼問題? * ::before、::after、::first-line、::first-letter和::selection - 偽元素的內容實際上不存在網頁裡 - 塞了太多的重要的內容,反而會影響到 SEO 的成效 ## JavaScript ### Junior * null,undefined 差在哪 * function有哪幾種宣告方式?有什麼差別? * let const var * hoisting * promise / callback * closure * var a = 1 -> 這段實際上是怎麼執行的? ### Senior * 什麼是this,怎麼改變它得reference? * Javascript的繼承 * Event loop * immutable & mutable ## React ### Junior * Why React? jQuery 不好嗎?用三句話說服我從jQuery改React * 什麼是Component? * 什麼是state? 怎麼改變state? * 大概有哪些Lifecycle?(constructor,componentDidMount...) * 請解釋 HOC,你會用在什麼情境下 * 知道 hooks 嗎?他解決什麼問題? ### Senior * 知道shouldComponentUpdate嗎?為什麼我們要小心用它? * 你知道 fiber 嗎? * 請解釋 react 的 Concurrent Mode 和 Suspense * Virtual dom - 以 JavaScript 物件模擬特定 DOM 結構而產生的樹狀結構。 - 用途是不直接操作 DOM,而改操作這些物件 - 待一個段落後,再將這些變更更新回真實的 DOM 上,以期提升效能。 ## Redux ### Junior * 可否基本介紹Redux * 非同步的情況下要怎麼使用action去處理side effect ## 其他 * GraphQL * server side render 好處與壞處 - 優點 1. SEO 2. 速度 3. 對於 mobile 減少 client side 的電量消耗 - 缺點 1. server loading 重 2. 不論點擊什麼網頁上什麼功能,每一次都是將整個畫面重新繪製 3. 使用者體驗不佳: 須重新reload 頁面才能拿到新的頁面 * firebase * Backend as Service * 缺點 * api-key 直接暴露 * 純使用 realtime DB,會把邏輯都放在前端

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