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如何解剖一个网站?

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Jun 07, 2016 am 08:43 AM

国外有非常多不错的动态网页作品，非常喜欢，请问如果想要分析他的制作过程需要怎么做

回复内容：

謝邀～

Html5網頁動畫
其實都是一個一個物體的
某個屬性的改變

通過
Chrome的右鍵→檢查元素
可以看到
一個特定物體的CSS 動畫屬性
是怎麼被編輯的

進而了解這個物體
是怎麼運動的

下面就舉一個解剖網站的例子

有一個 Starbucks Frappuccino® 網站
我很喜歡的動畫是
在移動端上的Toggle導航

右上角的「三」（叫Toggle）在點下去導航列展開後會旋轉變成「X」
代表說再點我一次可以關掉導航
非常有趣
可以點開gif看:
http://manglekuo.com/img/toggle.gif

所以一開始我現在電腦上的Chrome
把Chrome的頁面寬度變窄讓他出現那個Toggle
然後右鍵點那個Toggle→ 檢查元素

這時候可以看到 開發人員工具
出現在頁面下方
我在這裡為了方便截圖
把它拆了出來
放到了右邊

如下圖：

而當我點擊了那個Toggle之後
我發現那個div的class
從原來的"sbOne mobile"
變成了"sbOne mobile expanded"

如下圖（注意看兩張圖被選擇的那行的上一行的差別）

這是一個網頁動畫很常被使用的技巧
發生一個事件（在這裡是點擊）之後
用Javascript
改變class裡的內容
進而觸發動畫

這時候我們去CSS（在這裡是main.css，隨便點擊截圖中最右邊任意一個main.css?...那一長串就可以去到main.css）裡頭
用ctrl/command + F 找到 ".expanded" Class

如下圖（圖長可能需要點擊一下才能看到全部）

最下面那一大段一直重複的
就是我們想要的了。

因為 HTML 5 動畫
還是實驗性的東西
開發者為了要讓各大瀏覽器支持
需要加不同的前綴。

HTML 5 動畫有兩種

一種是Animation，一種就是這個Transition
（感興趣自己查）

Animation是可以指定幀的
比如說時間是0%－20%的時候轉130º，
20%－100%的時候轉50º

而Transition是只能製定屬性和時間
在這裏是all 1s;
也就是所有屬性一秒
代表說假如有任何屬性發生了改變
都用一秒的漸變來完成

而上面用了transform: rotate(-45deg);
所以就會用一秒的時間漸漸轉－45º的角度

再下面的兩段代碼他指定了第一根橫棒和最後一根橫棒的動畫...（下圖）

根據電腦代碼的
後面覆蓋前面原則
最終會變成

當按下去Toggle之後
第一根橫棒轉45º
第二根橫棒轉-45º
第三根橫棒不轉透明度變0
三根橫棒的所有屬性發生改變時有1秒漸變

跟我們觀察到的結果一樣！
所以這就是這個動畫的精髓所在！

我們成功的解剖到了我們想要的東西。

還有什麼問題嗎。。。
我懶得接著寫了。。。
你直接問吧。。。国外的很多动态网页，通常都是由js生成页面dom并入场，这类网站信息量少，页面数量也少，但是交互性很强。研究这类网站重点看js。摘出需要的部分，或者删掉不需要的部分。

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