JavaScript 插件可以单个引入（使用 Bootstrap 提供的单个 *.js 文件），或者一次性全部引入（使用 bootstrap.js 或压缩版的 bootstrap.min.js）。

bootstrap.js 和 bootstrap.min.js 都包含了所有插件，你在使用时，只需选择一个引入页面就可以了。

某些插件和 CSS 组件依赖于其它插件。如果你是单个引入每个插件的，请确保在文档中检查插件之间的依赖关系。注意，所有插件都依赖 jQuery （也就是说，jQuery必须在所有插件之前引入页面）。 bower.json 文件中列出了 Bootstrap 所支持的 jQuery 版本。

你可以仅仅通过 data 属性 API 就能使用所有的 Bootstrap 插件，无需写一行 JavaScript 代码。这是 Bootstrap 中的一等 API，也应该是你的首选方式。

话又说回来，在某些情况下可能需要将此功能关闭。因此，我们还提供了关闭 data 属性 API 的方法，即解除以 data-api 为命名空间并绑定在文档上的事件。就像下面这样：

另外，如果是针对某个特定的插件，只需在 data-api 前面添加那个插件的名称作为命名空间，如下：

Don't use data attributes from multiple plugins on the same element. For example, a button cannot both have a tooltip and toggle a modal. To accomplish this, use a wrapping element.

我们为所有 Bootstrap 插件提供了纯 JavaScript 方式的 API。所有公开的 API 都是支持单独或链式调用方式，并且返回其所操作的元素集合（注：和jQuery的调用形式一致）。

所有方法都可以接受一个可选的 option 对象作为参数，或者一个代表特定方法的字符串，或者什么也不提供（在这种情况下，插件将会以默认值初始化）：

每个插件还通过 Constructor 属性暴露了其原始的构造函数：$.fn.popover.Constructor。如果你想获取某个插件的实例，可以直接通过页面元素获取：$('[rel="popover"]').data('popover')。

每个插件都可以通过修改其自身的 Constructor.DEFAULTS 对象从而改变插件的默认设置：

某些时候可能需要将 Bootstrap 插件与其他 UI 框架共同使用。在这种情况下，命名空间冲突随时可能发生。如果不幸发生了这种情况，你可以通过调用插件的 .noConflict 方法恢复其原始值。

Bootstrap 为大部分插件所具有的动作提供了自定义事件。一般来说，这些事件都有不定式和过去式两种动词的命名形式，例如，不定式形式的动词（例如 show）表示其在事件开始时被触发；而过去式动词（例如 shown ）表示在动作执行完毕之后被触发。

从 3.0.0 版本开始，所有 Bootstrap 事件的名称都采用命名空间方式。

所有以不定式形式的动词命名的事件都提供了 preventDefault 功能。这就赋予你在动作开始执行前将其停止的能力。

Tooltips and Popovers use our built-in sanitizer to sanitize options which accept HTML.

The default whiteList value is the following:

If you want to add new values to this default whiteList you can do the following:

If you want to bypass our sanitizer because you prefer to use a dedicated library, for example DOMPurify, you should do the following:

In case of browsers that don't support document.implementation.createHTMLDocument, like Internet Explorer 8, the built-in sanitize function returns the HTML as is.

If you want to perform sanitization in this case, please specify sanitizeFn and use an external library like DOMPurify.

每个 Bootstrap 的 jQuery 插件的版本号都可以通过插件的构造函数上的 VERSION 属性获取到。例如工具提示框（tooltip）插件：

Bootstrap 插件未对禁用 JavaScript 的浏览器提供补救措施。如果你对这种情况下的用户体验很关心的话，请添加 标签向你的用户进行解释（并告诉他们如何启用 JavaScript），或者按照你自己的方式提供补救措施。

Bootstrap 官方不提供对第三方 JavaScript 工具库的支持，例如 Prototype 或 jQuery UI。除了 .noConflict 和为事件名称添加命名空间，还可能会有兼容性方面的问题，这就需要你自己来处理了。

对于简单的过渡效果，只需将 transition.js 和其它 JS 文件一起引入即可。如果你使用的是编译（或压缩）版的 bootstrap.js 文件，就无需再单独将其引入了。

Transition.js 是针对 transitionEnd 事件的一个基本辅助工具，也是对 CSS 过渡效果的模拟。它被其它插件用来检测当前浏览器对是否支持 CSS 的过渡效果。

通过下面的 JavaScript 代码可以在全局范围禁用过渡效果，并且必须将此代码放在 transition.js （或 bootstrap.js 或 bootstrap.min.js）后面，确保在 js 文件加载完毕后再执行下面的代码：

模态框经过了优化，更加灵活，以弹出对话框的形式出现，具有最小和最实用的功能集。

千万不要在一个模态框上重叠另一个模态框。要想同时支持多个模态框，需要自己写额外的代码来实现。

务必将模态框的 HTML 代码放在文档的最高层级内（也就是说，尽量作为 body 标签的直接子元素），以避免其他组件影响模态框的展现和/或功能。

在移动设备上使用模态框有一些额外要注意的事项。请参考 对浏览器的支持 章节获取更多信息。

Due to how HTML5 defines its semantics, the autofocus HTML attribute has no effect in Bootstrap modals. To achieve the same effect, use some custom JavaScript:

以下模态框包含了模态框的头、体和一组放置于底部的按钮。

One fine body…

One fine body…

点击下面的按钮即可通过 JavaScript 启动一个模态框。此模态框将从上到下、逐渐浮现到页面前。

Duis mollis, est non commodo luctus, nisi erat porttitor ligula.

This button should trigger a popover on click.

This link and that link should have tooltips on hover.

Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.

Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.

Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.

Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.

Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.

Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.

Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.

Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.

Aenean lacinia bibendum nulla sed consectetur. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Donec ullamcorper nulla non metus auctor fringilla.

务必为 .modal 添加 role="dialog" 和 aria-labelledby="..." 属性，用于指向模态框的标题栏；为 .modal-dialog 添加 aria-hidden="true" 属性。

另外，你还应该通过 aria-describedby 属性为模态框 .modal 添加描述性信息。

在模态框中嵌入 YouTube 视频需要增加一些额外的 JavaScript 代码，用于自动停止重放等功能，这些代码并没有在 Bootstrap 中提供。请参考这份发布在 Stack Overflow 上的文章。

模态框提供了两个可选尺寸，通过为 .modal-dialog 增加一个样式调整类实现。

如果你不需要模态框弹出时的动画效果（淡入淡出效果），删掉 .fade 类即可。

To take advantage of the Bootstrap grid system within a modal, just nest .rows within the .modal-body and then use the normal grid system classes.

Have a bunch of buttons that all trigger the same modal, just with slightly different contents? Use event.relatedTarget and HTML data-* attributes (possibly via jQuery) to vary the contents of the modal depending on which button was clicked. See the Modal Events docs for details on relatedTarget,

通过 data 属性或 JavaScript 调用模态框插件，可以根据需要动态展示隐藏的内容。模态框弹出时还会为 元素添加 .modal-open 类，从而覆盖页面默认的滚动行为，并且还会自动生成一个 .modal-backdrop 元素用于提供一个可点击的区域，点击此区域就即可关闭模态框。

不需写 JavaScript 代码也可激活模态框。通过在一个起控制器作用的元素（例如：按钮）上添加 data-toggle="modal" 属性，或者 data-target="#foo" 属性，再或者 href="#foo" 属性，用于指向被控制的模态框。

只需一行 JavaScript 代码，即可通过元素的 id myModal 调用模态框：

可以将选项通过 data 属性或 JavaScript 代码传递。对于 data 属性，需要将参数名称放到 data- 之后，例如 data-backdrop=""。

This option is deprecated since v3.3.0 and has been removed in v4. We recommend instead using client-side templating or a data binding framework, or calling jQuery.load yourself.

如果提供的是 URL，将利用 jQuery 的 load 方法从此 URL 地址加载要展示的内容（只加载一次）并插入 .modal-content 内。如果使用的是 data 属性 API，还可以利用 href 属性指定内容来源地址。下面是一个实例：

将页面中的某块内容作为模态框激活。接受可选参数 object。

手动打开或关闭模态框。在模态框显示或隐藏之前返回到主调函数中（也就是，在触发 shown.bs.modal 或 hidden.bs.modal 事件之前）。

手动打开模态框。在模态框显示之前返回到主调函数中 （也就是，在触发 shown.bs.modal 事件之前）。

手动隐藏模态框。在模态框隐藏之前返回到主调函数中 （也就是，在触发 hidden.bs.modal 事件之前）。

Readjusts the modal's positioning to counter a scrollbar in case one should appear, which would make the modal jump to the left.

Only needed when the height of the modal changes while it is open.

Bootstrap 的模态框类提供了一些事件用于监听并执行你自己的代码。

All modal events are fired at the modal itself (i.e. at the ).

Add dropdown menus to nearly anything with this simple plugin, including the navbar, tabs, and pills.

Via data attributes or JavaScript, the dropdown plugin toggles hidden content (dropdown menus) by toggling the .open class on the parent list item.

On mobile devices, opening a dropdown adds a .dropdown-backdrop as a tap area for closing dropdown menus when tapping outside the menu, a requirement for proper iOS support. This means that switching from an open dropdown menu to a different dropdown menu requires an extra tap on mobile.

Note: The data-toggle="dropdown" attribute is relied on for closing dropdown menus at an application level, so it's a good idea to always use it.

Add data-toggle="dropdown" to a link or button to toggle a dropdown.

To keep URLs intact with link buttons, use the data-target attribute instead of href="#".

Call the dropdowns via JavaScript:

Regardless of whether you call your dropdown via JavaScript or instead use the data-api, data-toggle="dropdown" is always required to be present on the dropdown's trigger element.

None

Toggles the dropdown menu of a given navbar or tabbed navigation.

All dropdown events are fired at the .dropdown-menu's parent element.

All dropdown events have a relatedTarget property, whose value is the toggling anchor element.

滚动监听插件是用来根据滚动条所处的位置来自动更新导航项的。如下所示，滚动导航条下面的区域并关注导航项的变化。下拉菜单中的条目也会自动高亮显示。

Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.

Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard. Freegan beard aliqua cupidatat mcsweeney's vero. Cupidatat four loko nisi, ea helvetica nulla carles. Tattooed cosby sweater food truck, mcsweeney's quis non freegan vinyl. Lo-fi wes anderson +1 sartorial. Carles non aesthetic exercitation quis gentrify. Brooklyn adipisicing craft beer vice keytar deserunt.

Occaecat commodo aliqua delectus. Fap craft beer deserunt skateboard ea. Lomo bicycle rights adipisicing banh mi, velit ea sunt next level locavore single-origin coffee in magna veniam. High life id vinyl, echo park consequat quis aliquip banh mi pitchfork. Vero VHS est adipisicing. Consectetur nisi DIY minim messenger bag. Cred ex in, sustainable delectus consectetur fanny pack iphone.

In incididunt echo park, officia deserunt mcsweeney's proident master cleanse thundercats sapiente veniam. Excepteur VHS elit, proident shoreditch +1 biodiesel laborum craft beer. Single-origin coffee wayfarers irure four loko, cupidatat terry richardson master cleanse. Assumenda you probably haven't heard of them art party fanny pack, tattooed nulla cardigan tempor ad. Proident wolf nesciunt sartorial keffiyeh eu banh mi sustainable. Elit wolf voluptate, lo-fi ea portland before they sold out four loko. Locavore enim nostrud mlkshk brooklyn nesciunt.

Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.

Keytar twee blog, culpa messenger bag marfa whatever delectus food truck. Sapiente synth id assumenda. Locavore sed helvetica cliche irony, thundercats you probably haven't heard of them consequat hoodie gluten-free lo-fi fap aliquip. Labore elit placeat before they sold out, terry richardson proident brunch nesciunt quis cosby sweater pariatur keffiyeh ut helvetica artisan. Cardigan craft beer seitan readymade velit. VHS chambray laboris tempor veniam. Anim mollit minim commodo ullamco thundercats.

滚动监听插件依赖 Bootstrap 的导航组件 用于高亮显示当前激活的链接。

Navbar links must have resolvable id targets. For example, a home must correspond to something in the DOM like .

Target elements that are not :visible according to jQuery will be ignored and their corresponding nav items will never be highlighted.

无论何种实现方式，滚动监听都需要被监听的组件是 position: relative; 即相对定位方式。大多数时候是监听 元素。When scrollspying on elements other than the , be sure to have a height set and overflow-y: scroll; applied.

To easily add scrollspy behavior to your topbar navigation, add data-spy="scroll" to the element you want to spy on (most typically this would be the ). Then add the data-target attribute with the ID or class of the parent element of any Bootstrap .nav component.

在 CSS 中添加 position: relative; 之后，通过 JavaScript 代码启动滚动监听插件：

当使用滚动监听插件的同时在 DOM 中添加或删除元素后，你需要像下面这样调用此刷新（ refresh） 方法：

可以通过 data 属性或 JavaScript 传递参数。对于 data 属性，其名称是将参数名附着到 data- 后面组成，例如 data-offset=""。

Add quick, dynamic tab functionality to transition through panes of local content, even via dropdown menus. Nested tabs are not supported.

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Food truck fixie locavore, accusamus mcsweeney's marfa nulla single-origin coffee squid. Exercitation +1 labore velit, blog sartorial PBR leggings next level wes anderson artisan four loko farm-to-table craft beer twee. Qui photo booth letterpress, commodo enim craft beer mlkshk aliquip jean shorts ullamco ad vinyl cillum PBR. Homo nostrud organic, assumenda labore aesthetic magna delectus mollit. Keytar helvetica VHS salvia yr, vero magna velit sapiente labore stumptown. Vegan fanny pack odio cillum wes anderson 8-bit, sustainable jean shorts beard ut DIY ethical culpa terry richardson biodiesel. Art party scenester stumptown, tumblr butcher vero sint qui sapiente accusamus tattooed echo park.

Etsy mixtape wayfarers, ethical wes anderson tofu before they sold out mcsweeney's organic lomo retro fanny pack lo-fi farm-to-table readymade. Messenger bag gentrify pitchfork tattooed craft beer, iphone skateboard locavore carles etsy salvia banksy hoodie helvetica. DIY synth PBR banksy irony. Leggings gentrify squid 8-bit cred pitchfork. Williamsburg banh mi whatever gluten-free, carles pitchfork biodiesel fixie etsy retro mlkshk vice blog. Scenester cred you probably haven't heard of them, vinyl craft beer blog stumptown. Pitchfork sustainable tofu synth chambray yr.

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This plugin extends the tabbed navigation component to add tabbable areas.

Enable tabbable tabs via JavaScript (each tab needs to be activated individually):

You can activate individual tabs in several ways:

You can activate a tab or pill navigation without writing any JavaScript by simply specifying data-toggle="tab" or data-toggle="pill" on an element. Adding the nav and nav-tabs classes to the tab ul will apply the Bootstrap tab styling, while adding the nav and nav-pills classes will apply pill styling.

To make tabs fade in, add .fade to each .tab-pane. The first tab pane must also have .in to make the initial content visible.

Activates a tab element and content container. Tab should have either a data-target or an href targeting a container node in the DOM. In the above examples, the tabs are the s with data-toggle="tab" attributes.

Selects the given tab and shows its associated content. Any other tab that was previously selected becomes unselected and its associated content is hidden. Returns to the caller before the tab pane has actually been shown (i.e. before the shown.bs.tab event occurs).

When showing a new tab, the events fire in the following order:

If no tab was already active, then the hide.bs.tab and hidden.bs.tab events will not be fired.

Inspired by the excellent jQuery.tipsy plugin written by Jason Frame; Tooltips are an updated version, which don't rely on images, use CSS3 for animations, and data-attributes for local title storage.

Tooltips with zero-length titles are never displayed.

Hover over the links below to see tooltips:

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Four options are available: top, right, bottom, and left aligned.

For performance reasons, the Tooltip and Popover data-apis are opt-in, meaning you must initialize them yourself.

One way to initialize all tooltips on a page would be to select them by their data-toggle attribute:

The tooltip plugin generates content and markup on demand, and by default places tooltips after their trigger element.

Trigger the tooltip via JavaScript:

The required markup for a tooltip is only a data attribute and title on the HTML element you wish to have a tooltip. The generated markup of a tooltip is rather simple, though it does require a position (by default, set to top by the plugin).

Sometimes you want to add a tooltip to a hyperlink that wraps multiple lines. The default behavior of the tooltip plugin is to center it horizontally and vertically. Add white-space: nowrap; to your anchors to avoid this.

When using tooltips on elements within a .btn-group or an .input-group, or on table-related elements (, , , , , ), you'll have to specify the option container: 'body' (documented below) to avoid unwanted side effects (such as the element growing wider and/or losing its rounded corners when the tooltip is triggered).

Invoking $(...).tooltip('show') when the target element is display: none; will cause the tooltip to be incorrectly positioned.

For users navigating with a keyboard, and in particular users of assistive technologies, you should only add tooltips to keyboard-focusable elements such as links, form controls, or any arbitrary element with a tabindex="0" attribute.

To add a tooltip to a disabled or .disabled element, put the element inside of a and apply the tooltip to that instead.

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-animation="".

Note that for security reasons the sanitize, sanitizeFn and whiteList options cannot be supplied using data attributes.

Appends the tooltip to a specific element. Example: container: 'body'. This option is particularly useful in that it allows you to position the tooltip in the flow of the document near the triggering element - which will prevent the tooltip from floating away from the triggering element during a window resize.

Delay showing and hiding the tooltip (ms) - does not apply to manual trigger type

If a number is supplied, delay is applied to both hide/show

Object structure is: delay: { "show": 500, "hide": 100 }

How to position the tooltip - top | bottom | left | right | auto.When "auto" is specified, it will dynamically reorient the tooltip. For example, if placement is "auto left", the tooltip will display to the left when possible, otherwise it will display right.

When a function is used to determine the placement, it is called with the tooltip DOM node as its first argument and the triggering element DOM node as its second. The this context is set to the tooltip instance.

Base HTML to use when creating the tooltip.

The tooltip's title will be injected into the .tooltip-inner.

.tooltip-arrow will become the tooltip's arrow.

The outermost wrapper element should have the .tooltip class.

Default title value if title attribute isn't present.

If a function is given, it will be called with its this reference set to the element that the tooltip is attached to.

Keeps the tooltip within the bounds of this element. Example: viewport: '#viewport' or { "selector": "#viewport", "padding": 0 }

If a function is given, it is called with the triggering element DOM node as its only argument. The this context is set to the tooltip instance.

Options for individual tooltips can alternatively be specified through the use of data attributes, as explained above.

Attaches a tooltip handler to an element collection.

Reveals an element's tooltip. Returns to the caller before the tooltip has actually been shown (i.e. before the shown.bs.tooltip event occurs). This is considered a "manual" triggering of the tooltip. Tooltips with zero-length titles are never displayed.

Hides an element's tooltip. Returns to the caller before the tooltip has actually been hidden (i.e. before the hidden.bs.tooltip event occurs). This is considered a "manual" triggering of the tooltip.

Toggles an element's tooltip. Returns to the caller before the tooltip has actually been shown or hidden (i.e. before the shown.bs.tooltip or hidden.bs.tooltip event occurs). This is considered a "manual" triggering of the tooltip.

Hides and destroys an element's tooltip. Tooltips that use delegation (which are created using the selector option) cannot be individually destroyed on descendant trigger elements.

为任意元素添加一小块浮层，就像 iPad 上一样，用于存放非主要信息。

弹出框的标题和内容的长度都是零的话将永远不会被显示出来。

弹出框依赖 工具提示插件 ，因此，如果你定制了 Bootstrap，一定要注意将依赖的插件编译进去。

由于性能的原因，工具提示和弹出框的 data 编程接口（data api）是必须要手动初始化的。

在一个页面上一次性初始化所有弹出框的方式是通过 data-toggle 属性选中他们：

When using popovers on elements within a .btn-group or an .input-group, or on table-related elements (, , , , , ), you'll have to specify the option container: 'body' (documented below) to avoid unwanted side effects (such as the element growing wider and/or losing its rounded corners when the popover is triggered).

Invoking $(...).popover('show') when the target element is display: none; will cause the popover to be incorrectly positioned.

To add a popover to a disabled or .disabled element, put the element inside of a and apply the popover to that instead.

Sometimes you want to add a popover to a hyperlink that wraps multiple lines. The default behavior of the popover plugin is to center it horizontally and vertically. Add white-space: nowrap; to your anchors to avoid this.

4个可能的弹出方向：顶部、右侧、底部和左侧。

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Sed posuere consectetur est at lobortis. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.

Sed posuere consectetur est at lobortis. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.

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通过使用 focus 触发器可以在用户点击弹出框是让其消失。

为了更好的跨浏览器和跨平台效果，你必须使用 签，不能 使用 标签，并且，还必须包含 role="button" 和 tabindex 属性。

通过 JavaScript 代码启动弹出框：

可以通过 data 属性或 JavaScript 传递参数。对于 data 属性，将参数名附着到 data- 后面，例如 data-animation=""。

Note that for security reasons the sanitize, sanitizeFn and whiteList options cannot be supplied using data attributes.

Appends the popover to a specific element. Example: container: 'body'. This option is particularly useful in that it allows you to position the popover in the flow of the document near the triggering element - which will prevent the popover from floating away from the triggering element during a window resize.

Default content value if data-content attribute isn't present.

If a function is given, it will be called with its this reference set to the element that the popover is attached to.

Delay showing and hiding the popover (ms) - does not apply to manual trigger type

If a number is supplied, delay is applied to both hide/show

Object structure is: delay: { "show": 500, "hide": 100 }

How to position the popover - top | bottom | left | right | auto.When "auto" is specified, it will dynamically reorient the popover. For example, if placement is "auto left", the popover will display to the left when possible, otherwise it will display right.

When a function is used to determine the placement, it is called with the popover DOM node as its first argument and the triggering element DOM node as its second. The this context is set to the popover instance.

Base HTML to use when creating the popover.

The popover's title will be injected into the .popover-title.

The popover's content will be injected into the .popover-content.

.arrow will become the popover's arrow.

The outermost wrapper element should have the .popover class.

Default title value if title attribute isn't present.

If a function is given, it will be called with its this reference set to the element that the popover is attached to.

Keeps the popover within the bounds of this element. Example: viewport: '#viewport' or { "selector": "#viewport", "padding": 0 }

If a function is given, it is called with the triggering element DOM node as its only argument. The this context is set to the popover instance.

Options for individual popovers can alternatively be specified through the use of data attributes, as explained above.

Initializes popovers for an element collection.

Reveals an element's popover. Returns to the caller before the popover has actually been shown (i.e. before the shown.bs.popover event occurs). This is considered a "manual" triggering of the popover. Popovers whose both title and content are zero-length are never displayed.

Hides an element's popover. Returns to the caller before the popover has actually been hidden (i.e. before the hidden.bs.popover event occurs). This is considered a "manual" triggering of the popover.

Toggles an element's popover. Returns to the caller before the popover has actually been shown or hidden (i.e. before the shown.bs.popover or hidden.bs.popover event occurs). This is considered a "manual" triggering of the popover.

Hides and destroys an element's popover. Popovers that use delegation (which are created using the selector option) cannot be individually destroyed on descendant trigger elements.

通过此插件可以为警告信息添加点击并消失的功能。

当使用 .close 按钮时，它必须是 .alert-dismissible 的第一个子元素，并且在它之前不能有任何文本内容。

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为关闭按钮添加 data-dismiss="alert" 属性就可以使其自动为警告框赋予关闭功能。关闭警告框也就是将其从 DOM 中删除。

为了让警告框在关闭时表现出动画效果，请确保为其添加了 .fade 和 .in 类。

让警告框监听具有 data-dismiss="alert" 属性的后裔元素的点击（click）事件。（如果是通过 data 属性进行的初始化则无需使用）

关闭警告框并从 DOM 中将其删除。如果警告框被赋予了 .fade 和 .in 类，那么，警告框在淡出之后才会被删除。

Bootstrap 的警告框插件对外暴露了一些可以被监听的事件。

按钮的功能很丰富。通过控制按钮的状态或创建一组按钮并形成一些新的组件，例如工具条。

在页面多次加载之间，Firefox 仍然保持表单控件的状态（禁用状态和选择状态）。一个解决办法是设置 autocomplete="off"。参见 Mozilla bug #654072。

通过添加 data-loading-text="Loading..." 可以为按钮设置正在加载的状态。

从 v3.3.5 版本开始，此特性不再建议使用，并且已经在 v4 版本中删除了。

For the sake of this demonstration, we are using data-loading-text and $().button('loading'), but that's not the only state you can use. See more on this below in the $().button(string) documentation.

Add data-toggle="button" to activate toggling on a single button.

For pre-toggled buttons, you must add the .active class and the aria-pressed="true" attribute to the button yourself.

Add data-toggle="buttons" to a .btn-group containing checkbox or radio inputs to enable toggling in their respective styles.

For preselected options, you must add the .active class to the input's label yourself.

If the checked state of a checkbox button is updated without firing a click event on the button (e.g. via or via setting the checked property of the input), you will need to toggle the .active class on the input's label yourself.

Toggles push state. Gives the button the appearance that it has been activated.

重置按钮状态 - 将按钮上的文本还原回原始的内容。此为异步方法，此方法在内容被重置完成之前即返回。

Swaps text to any data defined text state.

Flexible plugin that utilizes a handful of classes for easy toggle behavior.

Collapse requires the transitions plugin to be included in your version of Bootstrap.

Click the buttons below to show and hide another element via class changes:

You can use a link with the href attribute, or a button with the data-target attribute. In both cases, the data-toggle="collapse" is required.

Link with href

Extend the default collapse behavior to create an accordion with the panel component.

It's also possible to swap out .panel-bodys with .list-groups.

Be sure to add aria-expanded to the control element. This attribute explicitly defines the current state of the collapsible element to screen readers and similar assistive technologies. If the collapsible element is closed by default, it should have a value of aria-expanded="false". If you've set the collapsible element to be open by default using the in class, set aria-expanded="true" on the control instead. The plugin will automatically toggle this attribute based on whether or not the collapsible element has been opened or closed.

Additionally, if your control element is targeting a single collapsible element – i.e. the data-target attribute is pointing to an id selector – you may add an additional aria-controls attribute to the control element, containing the id of the collapsible element. Modern screen readers and similar assistive technologies make use of this attribute to provide users with additional shortcuts to navigate directly to the collapsible element itself.

The collapse plugin utilizes a few classes to handle the heavy lifting:

These classes can be found in component-animations.less.

Just add data-toggle="collapse" and a data-target to the element to automatically assign control of a collapsible element. The data-target attribute accepts a CSS selector to apply the collapse to. Be sure to add the class collapse to the collapsible element. If you'd like it to default open, add the additional class in.

To add accordion-like group management to a collapsible control, add the data attribute data-parent="#selector". Refer to the demo to see this in action.

Enable manually with:

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-parent="".

Activates your content as a collapsible element. Accepts an optional options object.

Toggles a collapsible element to shown or hidden. Returns to the caller before the collapsible element has actually been shown or hidden (i.e. before the shown.bs.collapse or hidden.bs.collapse event occurs).

Shows a collapsible element. Returns to the caller before the collapsible element has actually been shown (i.e. before the shown.bs.collapse event occurs).

Hides a collapsible element. Returns to the caller before the collapsible element has actually been hidden (i.e. before the hidden.bs.collapse event occurs).

Bootstrap's collapse class exposes a few events for hooking into collapse functionality.

A slideshow component for cycling through elements, like a carousel. Nested carousels are not supported.

The carousel component is generally not compliant with accessibility standards. If you need to be compliant, please consider other options for presenting your content.

Bootstrap exclusively uses CSS3 for its animations, but Internet Explorer 8 & 9 don't support the necessary CSS properties. Thus, there are no slide transition animations when using these browsers. We have intentionally decided not to include jQuery-based fallbacks for the transitions.

The .active class needs to be added to one of the slides. Otherwise, the carousel will not be visible.

The .glyphicon .glyphicon-chevron-left and .glyphicon .glyphicon-chevron-right classes are not necessarily needed for the controls. Bootstrap provides .icon-prev and .icon-next as plain unicode alternatives.

Add captions to your slides easily with the .carousel-caption element within any .item. Place just about any optional HTML within there and it will be automatically aligned and formatted.

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...

Carousels require the use of an id on the outermost container (the .carousel) for carousel controls to function properly. When adding multiple carousels, or when changing a carousel's id, be sure to update the relevant controls.

Use data attributes to easily control the position of the carousel. data-slide accepts the keywords prev or next, which alters the slide position relative to its current position. Alternatively, use data-slide-to to pass a raw slide index to the carousel data-slide-to="2", which shifts the slide position to a particular index beginning with 0.

The data-ride="carousel" attribute is used to mark a carousel as animating starting at page load. It cannot be used in combination with (redundant and unnecessary) explicit JavaScript initialization of the same carousel.

Call carousel manually with:

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-interval="".

Initializes the carousel with an optional options object and starts cycling through items.

Cycles through the carousel items from left to right.

Stops the carousel from cycling through items.

Cycles the carousel to a particular frame (0 based, similar to an array).

Cycles to the previous item.

Cycles to the next item.

Bootstrap's carousel class exposes two events for hooking into carousel functionality.

Both events have the following additional properties:

All carousel events are fired at the carousel itself (i.e. at the ).

The affix plugin toggles position: fixed; on and off, emulating the effect found with position: sticky;. The subnavigation on the right is a live demo of the affix plugin.

Use the affix plugin via data attributes or manually with your own JavaScript. In both situations, you must provide CSS for the positioning and width of your affixed content.

Note: Do not use the affix plugin on an element contained in a relatively positioned element, such as a pulled or pushed column, due to a Safari rendering bug.

The affix plugin toggles between three classes, each representing a particular state: .affix, .affix-top, and .affix-bottom. You must provide the styles, with the exception of position: fixed; on .affix, for these classes yourself (independent of this plugin) to handle the actual positions.

Here's how the affix plugin works:

Follow the above steps to set your CSS for either of the usage options below.

To easily add affix behavior to any element, just add data-spy="affix" to the element you want to spy on. Use offsets to define when to toggle the pinning of an element.

Call the affix plugin via JavaScript:

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-offset-top="200".

Activates your content as affixed content. Accepts an optional options object.

Recalculates the state of the affix based on the dimensions, position, and scroll position of the relevant elements. The .affix, .affix-top, and .affix-bottom classes are added to or removed from the affixed content according to the new state. This method needs to be called whenever the dimensions of the affixed content or the target element are changed, to ensure correct positioning of the affixed content.

Bootstrap's affix plugin exposes a few events for hooking into affix functionality.