根据今天的标准和网络术语，我想说Bootstrap实际上不是一个框架，尽管他们的网站上是这么说的。大多数开发人员会考虑Angular、Vue和React框架，而Bootstrap通常被称为“库”。

但是，准确地说，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，旨在提供比从头开始编写代码更快(也更聪明)开发常用web元素的方法。

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

It contains design templates and functionality for: layout, typography, forms, navigation, menus (including dropdowns), buttons, panels, badges, modals, alerts, tabs, collapsible, accordions, carousels, lists, tables, pagination, media utilities (including embeds, images and image replacement), responsiveness utilities, color-based utilities (primary, secondary, danger, warning, info, light, dark, muted, white), other utilities (position, margin, padding, sizing, spacing, alignment, visibility), scrollspy, affix, tooltips, popovers.

默认情况下，它依赖于jQuery，但你会发现jQuery免费变体由每个现代流行的渐进式JavaScript框架支持:

React-Bootstrap - React驱动的Bootstrap BootstrapVue - Vue驱动的Bootstrap ng-bootstrap——Angular支持的Bootstrap

使用Bootstrap很大程度上依赖于应用特定的类(或者，取决于JS框架:指令、方法或属性/道具)和使用特定的标记结构。

文档通常包含通用示例，这些示例可以轻松地复制粘贴并用作起始模板。

使用Bootstrap开发的另一个优势是它充满活力的社区，转化为丰富的主题、模板和插件，其中大多数是开源的(即:日历、日期/时间选择器、表格内容管理插件，以及构建在Bootstrap之上的库/组件集合，如MDB、投资组合模板、管理模板等…)

最后，但并非最不重要的是，Bootstrap多年来一直得到很好的维护，这使得它成为生产就绪应用程序/网站的可靠选择。

根据今天的标准和网络术语，我想说Bootstrap实际上不是一个框架，尽管他们的网站上是这么说的。大多数开发人员会考虑Angular、Vue和React框架，而Bootstrap通常被称为“库”。

但是，准确地说，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，旨在提供比从头开始编写代码更快(也更聪明)开发常用web元素的方法。

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

It contains design templates and functionality for: layout, typography, forms, navigation, menus (including dropdowns), buttons, panels, badges, modals, alerts, tabs, collapsible, accordions, carousels, lists, tables, pagination, media utilities (including embeds, images and image replacement), responsiveness utilities, color-based utilities (primary, secondary, danger, warning, info, light, dark, muted, white), other utilities (position, margin, padding, sizing, spacing, alignment, visibility), scrollspy, affix, tooltips, popovers.

默认情况下，它依赖于jQuery，但你会发现jQuery免费变体由每个现代流行的渐进式JavaScript框架支持:

React-Bootstrap - React驱动的Bootstrap BootstrapVue - Vue驱动的Bootstrap ng-bootstrap——Angular支持的Bootstrap

使用Bootstrap很大程度上依赖于应用特定的类(或者，取决于JS框架:指令、方法或属性/道具)和使用特定的标记结构。

文档通常包含通用示例，这些示例可以轻松地复制粘贴并用作起始模板。

使用Bootstrap开发的另一个优势是它充满活力的社区，转化为丰富的主题、模板和插件，其中大多数是开源的(即:日历、日期/时间选择器、表格内容管理插件，以及构建在Bootstrap之上的库/组件集合，如MDB、投资组合模板、管理模板等…)

最后，但并非最不重要的是，Bootstrap多年来一直得到很好的维护，这使得它成为生产就绪应用程序/网站的可靠选择。

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>

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

简单地说，Bootstrap可以理解为一个前端web框架，它是由Twitter创建的，用于更快地创建设备响应式web应用程序。Bootstrap也可以主要理解为定义在其中的CSS类的集合，可以简单地直接使用。它利用CSS, javascript, jQuery等在后台为Bootstrap元素创建样式，效果和动作。

You might know that we use CSS for styling webpage elements and create classes and assign classes to webpage elements to apply the style to them. Bootstrap here makes the designing simpler since we only have to include Bootstrap files and mention Bootstrap's predefined class names for our webpage elements and they will be styled automatically through Bootstrap. Through this, we get rid of writing our own CSS classes to style webpage elements. Most importantly Bootstrap is designed in such a way that makes your website device responsive and that is the main purpose of it. Other alternates for Bootstrap could be - Foundation, Materialize etc. frameworks.

Bootstrap让你从编写大量的CSS代码中解脱出来，它也节省了你在设计网页上花费的时间。

据我所知，Bootstrap是一个定义良好的CSS。虽然使用Bootstrap，你也可以使用JavaScript, jQuery等。但主要的区别是，使用Bootstrap，您可以只调用类名，然后在HTML表单上获得输出。如。按钮的着色，文本的塑造，使用布局。对于所有这些，您不必编写CSS文件，而只需使用正确的类名来塑造您的HTML表单。