September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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301
第
12
章
处理
HTML
1995
年，
Netscape
委托软件开发人员
Brendan Eich
创建一门编程语言，为
Netscape
Navigator
浏览器中的页面添加交互性。结果，
Eich
在
10
天内就开发出了后来声名
狼藉的
JavaScript
第一版。几年之后，
ECMAScript
标准订立，
JavaScript
成为一门
跨浏览器语言。
尽管标准早已确定，但是
Web
开发人员一直在与各种浏览器中的不同
JavaScript
引
擎或功能苦苦斗争。借助一些流行的库，例如
jQuery
，我们才能写出兼容多个浏览
器的
JavaScript
代码。值得庆幸的是，如今的浏览器大都使用统一的
JavaScript
语言
实现，
Web
开发人员终于可以不依赖库便写出与
HTML
页面交互的
JavaScript
代码。
处理
HTML
，其实处理的是
HTML
页面的数据表示形式，即文档对象模型（
Document
Object Model
，
DOM
）。本章的经典实例介绍如何与
HTML
页面的
DOM
交互，涉
及选择、更新和删除页面元素。
12.1
获取指定的元素，查找它的父元素和子元
素
12.1.1
问题
你想获取网页中的某个元素，找出它的父元素和子元素。
302
｜
第
12
章
12.1.2
方案
为元素设定一个唯一的标识符。
<div
id="demodiv" ...
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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.