网页开发基础:HTML、XHTML、CSS与JavaScript入门

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" Beginning HTML, XHTML, CSS, and JavaScript 2010 是一本面向初学者的编程指南,专注于网页开发的基础技术。这本书由 Jon Duckett 编写,旨在帮助读者理解并掌握构建网页的核心语言——HTML、XHTML、CSS 和 JavaScript。通过这本书,读者将学习如何有效地组织网页文档,创建链接与导航,处理图像、音频和视频,运用表格,构建表单,以及使用框架等元素来提升网页设计的层次和交互性。" 在深入探讨这些知识点之前,让我们先了解它们的重要性: 1. **HTML(HyperText Markup Language)**:HTML 是网页内容的基本结构语言,用于定义网页的各个元素,如标题、段落、列表、图像等。在本书中,读者将学习如何编写有效的 HTML 代码,遵循语义化原则来提高可读性和可访问性。 2. **XHTML(Extensible HyperText Markup Language)**:XHTML 是 HTML 的一个更严格、更纯净的版本,它结合了 HTML 的易用性和 XML 的严谨性。学习 XHTML 帮助开发者编写更规范的代码,以确保在各种浏览器上的兼容性。 3. **CSS(Cascading Style Sheets)**:CSS 用于控制网页的外观和布局,包括字体、颜色、间距、位置等。通过分离内容和表现,CSS 提供了更好的可维护性和可扩展性。书中的章节将引导读者掌握选择器的使用、样式继承、布局技术,如浮动和定位。 4. **JavaScript**:这是一种客户端脚本语言,用于增加网页的动态功能,如响应式交互、数据验证和动画效果。本书会介绍 JavaScript 基础,包括变量、函数、DOM 操作等,帮助读者实现更丰富的用户体验。 书中各章节涵盖了以下内容: - **第1章:结构化文档**:讲解如何使用 HTML 元素来组织和标记文本,创建基本的网页结构。 - **第2章:链接和导航**:介绍如何创建内部和外部链接,以及如何使用锚点实现页面内的跳转。 - **第3章:图像、音频和视频**:讲述如何插入和优化图像,以及如何使用 HTML5 的新特性支持音频和视频内容。 - **第4章:表格**:教授如何创建和格式化表格,包括行、列的合并以及复杂的表格布局。 - **第5章:表单**:涵盖表单元素的使用,如文本输入、复选框、单选按钮等,以及表单数据的验证。 - **第6章:框架**:虽然现代网页设计中框架的使用已减少,但本章仍介绍了如何使用框架来分隔和加载独立的网页内容。 - **第7章:层叠样式表(CSS)**:深入学习 CSS,包括选择器、属性、盒模型,以及布局技巧。 此外,本书还提供了 Wrox 社区资源,如论坛互动、在线图书馆、Wrox Blox(代码片段)以及章节按需购买服务,为读者提供了一个全面的学习环境。无论是对网页设计感兴趣的新手,还是希望巩固基础的开发者,都能从中受益。

Based on the following story, continue the story by writing two paragraphs, paragraph 1 beginning with "A few weeks later, I went to the farm again. " and paragraph 2 beginning with "I was just about to leave when the hummingbird appeared."respectively with 150 words. I was invited to a cookout on an old friend's farm in western Washington. I parked my car outside the farm and walked past a milking house which had apparently not been used in many years.A noise at a window caught my attention,so I entered it. It was a hummingbird,desperately trying to escape. She was covered in spider-webs and was barely able to move her wings. She ceased her struggle the instant I picked her up. With the bird in my cupped hand, I looked around to see how she had gotten in. The broken window glass was the likely answer. I stuffed a piece of cloth into the hole and took her outside,closing the door securely behind me. When I opened my hand, the bird did not fly away; she sat looking at me with her bright eyes.I removed the sticky spider-webs that covered her head and wings. Still, she made no attempt to fly.Perhaps she had been struggling against the window too long and was too tired? Or too thirsty? As I carried her up the blackberry-lined path toward my car where I kept a water bottle, she began to move. I stopped, and she soon took wing but did not immediately fly away. Hovering,she approached within six inches of my face. For a very long moment,this tiny creature looked into my eyes, turning her head from side to side. Then she flew quickly out of sight. During the cookout, I told my hosts about the hummingbird incident. They promised to fix the window. As I was departing, my friends walked me to my car. I was standing by the car when a hummingbird flew to the center of our group and began hovering. She turned from person to person until she came to me. She again looked directly into my eyes, then let out a squeaking call and was gone. For a moment, all were speechless. Then someone said, “She must have come to say good-bye.”

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