First contact with Bootstrap framework
About Bootstrap, not much to say, let’s go directly to the topic:
Installation
can be downloaded and installed through the bootstrap official website
can be installed through Bower (about bower, a package manager, this article will not explain it in detail)
bower install bootstrap
can be installed through npm (you can read about npm)
npm install bootstrap
Introduced Bootstrap
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>BootstrapDemo</title> <!--step1:设置viewport--> <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no"> <!--step2:引入Bootstrap--> <link rel="stylesheet" href="css/bootstrap.css"> </head>
into the project
layout container
.container class is used for containers with fixed width and supporting responsive layout
<div class="container"> </div>
.container-fluid class is used for containers with 100% width and occupy the entire viewport
<div class="container-fluid"> </div>
Grid system
Bootstrap provides a set of responsive, mobile-first The fluid grid system, with the different screen or viewport size, the system will automatically divide into 12 parts;
The grid system is composed of a series of rows and columns. Create a page layout;
"row" must be contained in a .container or .container-fluid container,
Media queries in grid systems
Parameters in grid systems
Case code
<head>
<meta charset="UTF-8">
<title>Title</title>
<!--step1:设置viewport-->
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">
<!--step2:引入Bootstrap-->
<link rel="stylesheet" href="css/bootstrap.css">
<style>
.container .row div {
background-color: grey;
border:1px solid red;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">1</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">2</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">3</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">4</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">5</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">6</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">7</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">8</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">9</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">10</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">11</div>
<div class="col-lg-1 col-md-2 col-sm-3 col-xs-6">12</div>
</div>
</div>
</body>
The page effect will display different effects according to the size of the screen col-lg-, col-md-, col-sm-, col-xs-
Column offsets (offsets) in the grid system
col-lg-offset-
<head>
<meta charset="UTF-8">
<title>Title</title>
<!--step1:设置viewport-->
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">
<!--step2:引入Bootstrap-->
<link rel="stylesheet" href="css/bootstrap.css">
<style>
.container .row div {
background-color: grey;
border:1px solid red;
}
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-lg-offset-11 col-lg-1">row - col -1</div>
</div>
</div>
</body>
The effect is as follows (offset by 11 columns)
Columns in the grid system Nesting
<div class="container"> <div class="row"> <div class="col-lg-4 col-md-2 col-sm-3 col-xs-6">1</div> <div class="col-lg-8 col-md-2 col-sm-3 col-xs-6">2 <div class="row"> <div class="col-lg-3 col-md-2 col-sm-3 col-xs-6">3</div> <div class="col-lg-3 col-md-2 col-sm-3 col-xs-6">4</div> <div class="col-lg-3 col-md-2 col-sm-3 col-xs-6">5</div> <div class="col-lg-3 col-md-2 col-sm-3 col-xs-6">6</div> </div> </div> </div> </div>
The effect is as follows
Fluid layout container
Change the outermost layout element .container to .container-fluid, and you can convert the fixed grid layout into a 100% width layout
<div class="contaienr-fluid"> <div class="row"> </div> </div>
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