## Commonly used classes in bootstrap:
Basic class.code来显示单行内联代码 .pre来显示多行块代码 .kbd来显示用户输入代码 .pre-scrollable高度超出340px,就会在Y轴出现滚动条Table class
.table基础表格margin-bottom:20px,在thead底部2px的浅灰实线,每个单元格顶部1px的浅灰实线 .table-striped:斑马线表格,隔行有一个浅灰色的背景色 .table-bordered:带边框的表格,所有单元格有1px的边框 .table-hover:鼠标悬停在表格的行上,有高亮的背景色 .table-condensed:将单元格的内距由8px调至5px .table-responsive:设置类名.table-responsive的容器,将<table class="table">置于这个容器中Classes of table rows
.active表示当前活动信息 .success成功或正确的行为 .info表示中立信息或行为 .warning表示警告 .danger表示危险活着错误行为Except for .active, the other four class names should match .table-hoverForm.form- horizontal form effect, matching the grid system of the Bootstrap framework; setting the padding and margin values of the form controls; changing the expression of "form-group", similar to the "row" of the grid system
also when using input in Bootstrap The type type must be added
In order to make the control style correct in various form styles, it is necessary to add .form-control
Multiple row selection to set the value of the multiple attribute to multiple
rows defines the height, and cols sets the width. .form-control, there is no need for cols
Both checkbox and radio use the label package
If the checkbox needs to be arranged horizontally, you only need to add the class name "checkbox-inline" to the label label
body { padding-top: 70px;/*有顶部固定导航条时设置*/ padding-bottom: 70px;/*有底部固定导航条时设置*/ } <div class="navbar navbar-default navbar-fixed-top" role="navigation"> … </div>In fact, in addition to this solution, we have other solutions, placing the fixed navigation bar on the page content Front:
<div class="navbar navbar-default navbar-fixed-bottom" role="navigation"> … </div> <div class="content">我是内容</div>Add the following style code in the file:
.navbar-fixed-top ~ .content { padding-top: 70px; } .navbar-fixed-bottom ~ .content { padding-bottom: 70px; }Recommended:
bootstrap Getting Started Tutorial
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Bootstrap is an open source front-end framework, and its main function is to help developers quickly build responsive websites. 1) It provides predefined CSS classes and JavaScript plug-ins to facilitate the implementation of complex UI effects. 2) The working principle of Bootstrap relies on its CSS and JavaScript components to realize responsive design through media queries. 3) Examples of usage include basic usage, such as creating buttons, and advanced usage, such as custom styles. 4) Common errors include misspelling of class names and incorrectly introducing files. It is recommended to use browser developer tools to debug. 5) Performance optimization can be achieved through custom build tools, best practices include predefined using semantic HTML and Bootstrap

Bootstrap implements responsive design through grid systems and media queries, making the website adapted to different devices. 1. Use a predefined class (such as col-sm-6) to define the column width. 2. The grid system is based on 12 columns, and it is necessary to note that the sum does not exceed 12. 3. Use breakpoints (such as sm, md, lg) to define the layout under different screen sizes.

Bootstrap is an open source front-end framework for rapid development of responsive websites and applications. 1. It provides the advantages of responsive design, consistent UI components and rapid development. 2. The grid system uses flexbox layout, based on 12-column structure, and is implemented through classes such as .container, .row and .col-sm-6. 3. Custom styles can be implemented by modifying SASS variables or overwriting CSS. 4. Commonly used JavaScript components include modal boxes, carousel diagrams and folding. 5. Optimization performance can be achieved by loading only necessary components, using CDN, and compressing merge files.

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There are several ways to insert images in Bootstrap: insert images directly, using the HTML img tag. With the Bootstrap image component, you can provide responsive images and more styles. Set the image size, use the img-fluid class to make the image adaptable. Set the border, using the img-bordered class. Set the rounded corners and use the img-rounded class. Set the shadow, use the shadow class. Resize and position the image, using CSS style. Using the background image, use the background-image CSS property.


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