March 2012
Intermediate to advanced
244 pages
4h 42m
Chinese
Content preview from JavaScript 設計模式
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192
第八章
在這個例子中，文件只被更新了一次，造成了單次的 reflow/repaint，相對於前一個不好的
例子，每個段落都造成了更新。
文件片段對於在樹中新增節點很有用。不過當你要更新樹裡面某個現有的部分，你仍然可
以將變動批次處理。你可以將你要改變的子樹從根部複製一份，對複本做完所有的改變，
再用複本替換掉原本的節點：
事件
瀏覽器 script 編寫的另一個部分─事件，例如 click，mouseover 等等，也充滿了不一致，
是另一個挫折之源。再次強調，為了同時支援（第 9 版之前的）IE 和 W3C 標準，所必須
耗費的雙倍工作，你可以用 JavaScript 函式庫來帶走大部分。
讓我們來仔細看一遍重點，因為在較簡單的頁面，或是要快速完成的工作中，你也許並不
一定會使用現成的函式庫，或者也許你正在建立你自己的函式庫。[185]
事件處理
事件處理皆從在元素上附加事件監聽器開始。假設你有個按鈕，在你每次點擊時會將計數
器加一。你可以使用一個內嵌的
onclick
屬性，這樣就可以跨瀏覽器運作，但卻違反了關
注點分離和漸進式增強的原則。所以你應該努力讓附加監聽器寫在 JavaScript 裡面，在所
有的標記之外。
對 clone 進行操作...
當你完成之後：
DOM 和瀏覽器的模式
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.