回复内容:
Canvas是使用JavaScript程序绘图(动态生成),SVG是使用XML文档描述来绘图。从这点来看:SVG更适合用来做动态交互,而且SVG绘图很容易编辑,只需要增加或移除相应的元素就可以了。
同时SVG是基于矢量的,所有它能够很好的处理图形大小的改变。Canvas是基于位图的图像,它不能够改变大小,只能缩放显示;所以说Canvas更适合用来实现类似于Flash能做的事情(当然现在Canvas与Flash相比还有一些不够完善的地方)。
关于最后一点二者谁更有前途:从上面我们可以知道二者是有不同用途的,作为一个开发者,你应该做的是理解应用程序的具体需求并选择正确的技术来实现它。
这两种技术都搞过,几年前写过SVG,最近研究Canvas,两者各有各的适用范围:
Canvas适用场景
Canvas提供的功能更原始,适合像素处理,动态渲染和大数据量绘制
SVG适用场景
SVG功能更完善,适合静态图片展示,高保真文档查看和打印的应用场景
下面的内容引自:HTML5之图形绘制技术(Canvas Vs SVG)
Canvas和SVG是HTML5中主要的2D图形技术,前者提供画布标签和绘制API,后者是一整套独立的矢量图形语言,成为W3C标准已经有十多年(2003.1至今),总的来说,Canvas技术较新,从很小众发展到广泛接受,注重栅格图像处理,SVG则历史悠久,很早就成为国际标准,复杂,发展缓慢(Adobe SVG Viewer近十年没有大的更新)

Canvas vs SVG

SVG与Canvas主要特点
根据两者的不同特点,Canvas和SVG有各自的适用范围
Canvas适用场景
Canvas提供的功能更原始,适合像素处理,动态渲染和大数据量绘制
SVG适用场景
SVG功能更完善,适合静态图片展示,高保真文档查看和打印的应用场景

1.对于画在Canvas上的部件,你需要处理重绘。而SVG则不用,你修改svg dom则系统会自动帮你重绘
2.Hittest,即canvas不负责帮你侦测鼠标/触摸事件发生在哪一个图形元件上;而svg可以。
3.Canvas效率高得多
如果还不够直观,可以找一些类比:
canvas的工作方式就像传统的2d图形引擎比如GDI;而SVG的工作方式更像WPF(XAML)、HTML/CSS这类由标记控制的绘图引擎 存在意味着合理 不如问两者分别适合什么场景 canvas是个像素库 绘制完了基本不记录过程 更快 svg建立了一大堆可交互对象 本性长于交互 但性能会弱些 但这种界限也在被一些js库打破 如fabric.js 以及百度林峰的zRender 这些库在canvas上构建一层mvc层 可以如svg一样操作和交互 性能上往往比原生svg要好一些 正如此 在基于zRender的可视化库可以绘制数万个点 倘使用svg 早挂了。而webgl-canvas实时绘点是百万级的 所以看你的场景 如果pc端强交互少元素 svg胜出 | pc端弱交互而强性能 用canvas | pc端超强性能 webgl-canvas | 移动端弱交互 原生canvas挺好(木有ie的世界真好) | 移动端强交互 刚才提到的一些基于canvas的库不错(svg性能很挫) sorry这是个设备和需求的二维表 偷懒了。 个人的经验 有误请拍 http://msdn.microsoft.com/zh-cn/library/ie/gg193983(v=vs.85).aspx Canvas
- 依赖分辨率
- 不支持事件处理器
- 弱的文本渲染能力
- 能够以 .png 或 .jpg 格式保存结果图像
- 最适合图像密集型的游戏,其中的许多对象会被频繁重绘
- 不依赖分辨率
- 支持事件处理器
- 最适合带有大型渲染区域的应用程序(比如谷歌地图)
- 复杂度高会减慢渲染速度(任何过度使用 DOM 的应用都不快)
- 不适合游戏应用
以canvas为基础开发的图表插件 也是对内部矢量图形格式进行渲染
做图表
想要折腾就用canvas
简单美观
就用svg
另外svg当然不适合做游戏
万一哪天 浏览器直接进化为3d渲染引擎 直接拖个3d格式文件进来就能看 也未尝不可
现阶段只是用canvas来做渲染引擎 我觉得SVG在"遥远"的将来更有前途 SVG跟Canvas的关系就像几何与美术
So,你觉得哪个更有前途?

HTML5 is the latest version of the Hypertext Markup Language, standardized by W3C. HTML5 introduces new semantic tags, multimedia support and form enhancements, improving web structure, user experience and SEO effects. HTML5 introduces new semantic tags, such as, ,, etc., to make the web page structure clearer and the SEO effect better. HTML5 supports multimedia elements and no third-party plug-ins are required, improving user experience and loading speed. HTML5 enhances form functions and introduces new input types such as, etc., which improves user experience and form verification efficiency.

How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.

H5 improves web user experience with multimedia support, offline storage and performance optimization. 1) Multimedia support: H5 and elements simplify development and improve user experience. 2) Offline storage: WebStorage and IndexedDB allow offline use to improve the experience. 3) Performance optimization: WebWorkers and elements optimize performance to reduce bandwidth consumption.

HTML5 code consists of tags, elements and attributes: 1. The tag defines the content type and is surrounded by angle brackets, such as. 2. Elements are composed of start tags, contents and end tags, such as contents. 3. Attributes define key-value pairs in the start tag, enhance functions, such as. These are the basic units for building web structure.

HTML5 is a key technology for building modern web pages, providing many new elements and features. 1. HTML5 introduces semantic elements such as, , etc., which enhances web page structure and SEO. 2. Support multimedia elements and embed media without plug-ins. 3. Forms enhance new input types and verification properties, simplifying the verification process. 4. Offer offline and local storage functions to improve web page performance and user experience.

Best practices for H5 code include: 1. Use correct DOCTYPE declarations and character encoding; 2. Use semantic tags; 3. Reduce HTTP requests; 4. Use asynchronous loading; 5. Optimize images. These practices can improve the efficiency, maintainability and user experience of web pages.

Web standards and technologies have evolved from HTML4, CSS2 and simple JavaScript to date and have undergone significant developments. 1) HTML5 introduces APIs such as Canvas and WebStorage, which enhances the complexity and interactivity of web applications. 2) CSS3 adds animation and transition functions to make the page more effective. 3) JavaScript improves development efficiency and code readability through modern syntax of Node.js and ES6, such as arrow functions and classes. These changes have promoted the development of performance optimization and best practices of web applications.

H5 is not just the abbreviation of HTML5, it represents a wider modern web development technology ecosystem: 1. H5 includes HTML5, CSS3, JavaScript and related APIs and technologies; 2. It provides a richer, interactive and smooth user experience, and can run seamlessly on multiple devices; 3. Using the H5 technology stack, you can create responsive web pages and complex interactive functions.


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