HTML初探
HTML是一种标记语言,是采用标签的形式对纯文本进行标记。然后由解释器进行解释,进而使文本显示出不同的格式。
HTML标签
HTML标签主要有三种形式:
每个标签必须要有结束标志。HTML中标签的种类以及效果如表一所示。
标签 | 效果 |
---|---|
test | 末尾有空行的段落 |
head | 一号标题 |
head | 二号标题 |
一条水平线 | |
text | 黑体 |
text | 斜体 |
text | 完全按照代码格式的文本 |
text | 计算机代码文本(没看出有什么区别) |
注释,被忽略 | |
…… | …… |
JavaScript脚本语言是一种面向浏览器的网页脚本编程语言。脚本语言有以下几个特性:
在客户端执行。完全在用户的计算机上运行,无须经过服务器。
面向对象。具有内置对象,也可以直接操作浏览器对象。
动态变化。可以对用户的输入作出反应,也可以直接对用户输出。
简单易用。JavaScript脚本语言虽然简单,但初学者也能快速掌握。
只能与HTML语言一起使用。要通过浏览器解释执行。
插入javascript
JavaScript采用如下格式插入在html语言中:
<script language="JavaScript">//js语句alert("你好");</script>
或者直接在地址栏输入:
javascript:alert(200*75)
或者将代码单独保存在 *.js 文件中,在需要时再调用。
<script language="javascript" src="test.js"></script>
javascrip语法
(暂时认定和java一样→_→)

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.


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