Bootstrap is an open-source Javascript framework developed by the team at Twitter. It is a combination of HTML, CSS, and Javascript code designed to help build user interface components. Bootstrap was also programmed to support both HTML5 and CSS3. Also it is called Front-end-framework. Bootstrap is a free collection of tools for creating a websites and web applications. It contains HTML and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions. Some Reasons for programmers preferred Bootstrap Framework Easy to get started Great grid system Base styling for most HTML elements(Typography,Code,Tables,Forms,Buttons,Images,Icons) Extensive list of components Bundled Javascript plugins

摘自About Bootstrap Framework

它是一个HTML、CSS和JavaScript开源框架(最初由Twitter创建)，您可以使用它作为创建网站或web应用程序的基础。

更多信息和下载链接 开始 例子 主题 引导-引导编辑器和生成器

更新

官方引导网站更新，包括一个明确的定义。

Bootstrap是最流行的HTML、CSS和JS框架，用于开发响应式、移动优先的web项目。”

“由@mdo和@fat用全世界所有的爱设计和建造。”

Bootstrap is an open-source CSS, JavaScript framework that was originally developed for twitter application by twitter's team of designers and developers. Then they released it for open-source. Being a longtime user of twitter bootstrap I find that its one of the best for designing mobile ready responsive websites. Many CSS and Javascript plugins are available for designing your website in no time. It's kind of rapid template design framework. Some people complain that the bootstrap CSS files are heavy and take time to load but these claims are made by lazy people. You don't have to keep the complete bootstrap.css in your website. You always have the option to remove the styles for components that you do not need for your website. For example, if you are only using basic components like forms and buttons then you can remove other components like accordions etc from the main CSS file. To start dabbling in bootstrap you can download the basic templates and components from getbootstrap site and let the magic happen.

Bootstrap是一个开源的，移动优先的CSS, JavaScript和HTML设计实用程序的集合，旨在提供方法来开发常用的web元素，比从头开始编码要快得多(和更聪明)。

促成Bootstrap成功的几个核心原则:

it's reusable it's flexible (i.e: allows custom grid systems, changing responsiveness breakpoints, column gutter sizes or state colors with ease; as a rule of thumb, most settings are controlled by global variables) it's intuitive it's modular (both JavaScript and (S)CSS use a modular approach; one can easily find tutorials on making custom Bootstrap builds, to include only the parts they need) has above average cross-browser compatibility web accessibility out of the box (screenreader ready) it's fairly well documented

Bootstrap是一个带有许多组件的HTML, CSS, JS框架，可以让您快速创建美丽而现代的网站或web应用程序。

以下网站包含示例、元素和可重用组件，您可以使用引导框架集成到您的项目中

bootsnipp.com

startbootstrap.com

bootdey.com

Bootstrap是开源的HTML框架。几乎所有浏览器都兼容。基本上大屏浏览器的宽度是>992px和特大号1200px。因此，通过使用Bootstrap定义的类，我们可以调整屏幕分辨率，以显示从小手机到大屏幕的每个屏幕上的内容。我尽量简短地解释。 例如:

<div class="col-sm-3">....</div>
<div class="col-sm-9">....</div>