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Professional JavaScript for Web Developers [推广有奖]

加关注串个门加好友发消息 0关注 463 粉丝巨擘 Nicolle 当前离线阅读权限 255 威望 16 级论坛币 12402323 个通用积分 1620.8615 学术水平 3305 点热心指数 3329 点信用等级 3095 点经验 477211 点帖子 23879 精华 91 在线时间 9878 小时注册时间 2005-4-23 最后登录 2022-3-6 雷达卡 0% 加关注串个门加好友发消息 0关注 463 粉丝巨擘 0% 巨擘积分 77103, 距离下一级还需 999922896 积分权限: 自定义头衔, 签名中使用图片, 隐身, 设置帖子权限, 设置回复可见, 签名中使用代码道具: 涂鸦板, 彩虹炫, 雷达卡, 热点灯, 显身卡, 匿名卡, 金钱卡, 变色卡, 抢沙发, 置顶卡, 提升卡, 沉默卡, 千斤顶还不是VIP/贵宾 - 还不是VIP/贵宾购买后可立即获得权限: 隐身道具: 金钱卡, 涂鸦板, 变色卡, 彩虹炫, 雷达卡, 热点灯 TA的文库其他... Python(Must-Read Books) SAS Programming Must-Read Books 0% 威望 16 级论坛币 12402323 个通用积分 1620.8615 学术水平 3305 点热心指数 3329 点信用等级 3095 点经验 477211 点帖子 23879 精华 91 在线时间 9878 小时注册时间 2005-4-23 最后登录 2022-3-6 该用户从未签到	Nicolle 发表于 2015-10-3 18:02:55 \|显示全部楼层 \|坛友微信交流群提示: 作者被禁止或删除内容自动屏蔽本帖被以下文库推荐 · JavaScript NewOccidental\|主题: 199, 订阅: 3 · 编程语言(Coding Languages)\|主题: 3936, 订阅: 126 · Java资源全汇\|主题: 743, 订阅: 22

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Jealy

发表于 2015-10-3 19:46:38 |显示全部楼层 |坛友微信交流群

学习一下，感谢分享哟！

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ReneeBK 发表于 2015-10-16 09:54:55 |显示全部楼层 |坛友微信交流群

Tag Placement
Traditionally, all <script> elements were placed within the <head> element on a page, such as in this example:
<html>
<head>
<title>Example HTML Page</title>
<script type="text/javascript" src="example1.js"></script>
<script type="text/javascript" src="example2.js"></script>
</head>
<body>
</body>
</html>

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ReneeBK 发表于 2015-10-16 09:55:37 |显示全部楼层 |坛友微信交流群

Deferred Scripts
HTML 4.01 defines an attribute named defer for the <script> element. The purpose of defer is to indicate that a script won't be changing the structure of the page as it executes. As such, the script can be run safely after the entire page has been parsed. Setting the defer attribute on a <script> element effectively, as shown in the following example, is the same as putting the <script> element at the very bottom of the page (as described in the previous section):
Code View: Scroll / Show All
<html>
<head>
<title>Example HTML Page</title>
<script type="text/javascript" defer="defer" src="example1.js"></script>
<script type="text/javascript" defer="defer" src="example2.js"></script>
</head>
<body>
</body>
</html>

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ReneeBK 发表于 2015-10-16 09:56:20 |显示全部楼层 |坛友微信交流群

Changes in XHTML
Extensible HyperText Markup Language, or XHTML, is a reformulation of HTML as an application of XML. The rules for writing code in XHTML are stricter than those for HTML, which affects the <script/> element when using embedded JavaScript code. Although valid in HTML, the following code block is invalid in XHTML:
<script type="text/javascript">
function compare(a, b) {
if (a < b) {
alert("A is less than B");
} else if (a > b) {
alert("A is greater than B");
} else {
alert("A is equal to B");
}
}
</script>

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ReneeBK 发表于 2015-10-16 09:57:17 |显示全部楼层 |坛友微信交流群

Deprecated Syntax
When the <script> element was originally introduced, it marked a departure from traditional HTML parsing. Special rules needed to be applied within this element, and that caused problems for browsers that didn't support JavaScript (the most notable being Mosaic). Nonsupporting browsers would output the contents of the <script> element onto the page, effectively ruining the page's appearance.
Netscape worked with Mosaic to come up with a solution that would hide embedded JavaScript code from browsers that didn't support it. The final solution was to enclose the script code in an HTML comment, like this:
<script><!--
function sayHi(){
alert("Hi!");
}
//--></script>
Using this format, browsers like Mosaic would safely ignore the content inside of the <script> tag, and browsers that supported JavaScript had to look for this pattern to recognize that there was indeed JavaScript content to be parsed.
Although this format is still recognized and interpreted correctly by all web browsers, it is no longer necessary and should not be used.

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ReneeBK 发表于 2015-10-16 09:58:57 |显示全部楼层 |坛友微信交流群

The <noscript> Element
<html>
<head>
<title>Example HTML Page</title>
<script type="text/javascript" defer="defer" src="example1.js"></script>
<script type="text/javascript" defer="defer" src="example2.js"></script>
</head>
<body>
<noscript>
<p>This page requires a JavaScript-enabled browser.</p>
</noscript>
</body>
</html>

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卯卯人 发表于 2018-2-8 09:02:38 |显示全部楼层 |坛友微信交流群

Book Description
If you want to achieve JavaScript's full potential, it is critical to understand its nature, history, and limitations. To that end, this updated version of the bestseller by veteran author and JavaScript guru Nicholas C. Zakas covers JavaScript from its very beginning to the present-day incarnations including the DOM, Ajax, and HTML5. Zakas shows you how to extend this powerful language to meet specific needs and create dynamic user interfaces for the web that blur the line between desktop and internet. By the end of the book, you'll have a strong understanding of the significant advances in web development as they relate to JavaScript so that you can apply them to your next website.
Book Details
Publisher:       Wrox
By:       Nicholas C. Zakas
ISBN:       978-1-1180-2669-4
Year:       2012
Pages:       960
Language:       English
File size:       53.1 MB
File format:       PDF
eBook
Download:       Professional JavaScript for Web Developers, 3rd Edition

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