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是你在腦中畫的改裝草圖。",[363,418,419],{},"改草圖幾乎沒有成本，但真的去敲牆、換窗戶，就需要謹慎評估。",[363,421,422],{},[423,424],"img",{"alt":425,"src":426},"Image","https://miro.medium.com/1%2ANLNoFfBWzu8Uu1RgWw3Z9g.jpeg",[363,428,429],{},[423,430],{"alt":425,"src":431},"https://miro.medium.com/1%2AiJKfCo2XlFtz-9ST0_HCtA.png",[381,433],{},[358,435,437],{"id":436},"virtual-dom-真正在做的事是什麼","Virtual DOM 真正在做的事是什麼？",[363,439,440,441,373],{},"當應用程式狀態改變時，框架會先建立一份「新的 Virtual DOM」，然後把它和「舊的 Virtual DOM」進行比較。這個比較過程，通常被稱為 ",[370,442,443],{},"diffing",[363,445,446],{},"diff 的目的不是重建整棵樹，而是找出「哪裡真的變了」。",[363,448,449],{},"例如，畫面中只有一個數字從 1 變成 2，那 diff 的結果可能只是：「某個文字節點內容改變了」。框架接著才會針對這個差異，精準地去操作真實 DOM，而不是整個畫面重畫一次。",[381,451],{},[358,453,454],{"id":454},"用一個簡化的程式概念來想",[363,456,457],{},"在 Vue 或 React 中，你通常只是在改「狀態」：",[459,460,465],"pre",{"className":461,"code":462,"language":463,"meta":464,"style":464},"language-js shiki shiki-themes github-dark","count.value++;\n","js","",[466,467,468],"code",{"__ignoreMap":464},[469,470,473,477,481],"span",{"class":471,"line":472},"line",1,[469,474,476],{"class":475},"s95oV","count.value",[469,478,480],{"class":479},"snl16","++",[469,482,483],{"class":475},";\n",[363,485,486],{},"你並沒有寫任何類似下面的程式碼：",[459,488,490],{"className":461,"code":489,"language":463,"meta":464,"style":464},"document.querySelector(\"#count\").textContent = count;\n",[466,491,492],{"__ignoreMap":464},[469,493,494,497,501,504,508,511,514],{"class":471,"line":472},[469,495,496],{"class":475},"document.",[469,498,500],{"class":499},"svObZ","querySelector",[469,502,503],{"class":475},"(",[469,505,507],{"class":506},"sU2Wk","\"#count\"",[469,509,510],{"class":475},").textContent ",[469,512,513],{"class":479},"=",[469,515,516],{"class":475}," count;\n",[363,518,519],{},"這是因為框架替你做了三件事：",[363,521,522],{},"第一，它根據狀態產生一份新的 Virtual DOM。\n第二，它把新舊 Virtual DOM 拿來比較，找出差異。\n第三，它只針對真正有差異的地方，更新真實 DOM。",[363,524,525],{},"你只負責「描述狀態長什麼樣子」，DOM 什麼時候、怎麼動，交給框架處理。",[381,527],{},[358,529,531],{"id":530},"那-virtual-dom-一定比較快嗎","那 Virtual DOM 一定比較快嗎？",[363,533,534,535,373],{},"這是一個常見誤解。\nVirtual DOM 並不是因為「它很快」才有價值，而是因為它",[370,536,537],{},"讓效能變得可預期、可控",[363,539,540],{},"直接操作 DOM，在「變化很小、次數很少」的情況下，反而可能比 Virtual DOM 更快。\n但在大型應用中，畫面更新來源複雜、狀態變化頻繁，Virtual DOM 可以避免你不小心做出大量無效的 DOM 操作。",[363,542,543,544,373],{},"它的真正價值在於：",[370,545,546],{},"把複雜度從「人」轉移到「框架」身上",[381,548],{},[358,550,552],{"id":551},"dom-與-virtual-dom-各自負責什麼","DOM 與 Virtual DOM 各自負責什麼？",[363,554,555],{},"可以這樣理解：",[363,557,558],{},"DOM 負責「畫面真正長什麼樣子」，\nVirtual DOM 負責「推導出畫面應該怎麼變」。",[363,560,561],{},"框架存在的意義，就是站在這兩者之間，替你做決策。",[381,563],{},[358,565,566],{"id":566},"結論",[363,568,569],{},"DOM 是瀏覽器真正用來顯示畫面的物件結構，而 Virtual DOM 則是前端框架在記憶體中維護的一份對照模型。框架先在 Virtual DOM 中計算差異，再將必要的變更套用到真實 DOM 上，以降低直接操作 DOM 帶來的成本與風險。",[363,571,572],{},"如果說 DOM 是「結果」，那 Virtual DOM 就是「過程」。",[381,574],{},[576,577,578],"style",{},"html pre.shiki code .s95oV, html code.shiki .s95oV{--shiki-default:#E1E4E8}html pre.shiki code .snl16, html code.shiki .snl16{--shiki-default:#F97583}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html pre.shiki code .svObZ, html code.shiki .svObZ{--shiki-default:#B392F0}html pre.shiki code .sU2Wk, html code.shiki .sU2Wk{--shiki-default:#9ECBFF}",{"title":464,"searchDepth":580,"depth":580,"links":581},2,[582,583,584,585,586,587,588,589],{"id":360,"depth":580,"text":361},{"id":385,"depth":580,"text":386},{"id":406,"depth":580,"text":407},{"id":436,"depth":580,"text":437},{"id":454,"depth":580,"text":454},{"id":530,"depth":580,"text":531},{"id":551,"depth":580,"text":552},{"id":566,"depth":580,"text":566},"探討 Virtual DOM 的基本概念、運作機制（Diffing），以及它與真實 DOM 的差異，幫助你理解現代前端框架如何提升開發效率與效能。","md",null,{"tags":594,"category":203,"date":600},[595,596,597,598,599],"virtual-dom","dom","javascript","performance","frontend","2026-02-03",true,{"title":231,"description":590},"Pj6WVGI9cOlqXTr3DBESV4JX4tFaOu-lpQku-IOynAg",[605,607],{"title":227,"path":228,"stem":229,"description":606,"children":-1},"一次搞懂 CSR、SSR、SSG 的差異、運作流程與適用情境，幫助你在 Nuxt、Vue 或現代前端專案中選擇最合適的渲染策略。",{"title":235,"path":236,"stem":237,"description":608,"children":-1},"探索 WebGL、Three.js 等 3D 與圖形渲染技術。",1776690845725]