study-notes标准文档流
默认情况下, 所有块级的元素, 都是独占一行, 且占用高度, 从上倒下排列的
浮动 float
一旦开启浮动就会脱离文档流, 且不会在占用文档流高度
| 取值 | 说明 |
|---|---|
| left | 左浮动 |
| right | 右浮动 |
css
#app {
border: 1px solid blue;
}
.box {
width: 100px;
height: 100px;
}
.bg-red {
background-color: red;
}
.bg-green {
background-color: green;
}
.float-right {
float: right;
}
.bg-blue {
background-color: blue;
}html
<!doctype html>
<html lang="zh-cn">
<head>
<title>JavaScript</title>
<link rel="stylesheet" href="./styles.css" type="text/css" />
</head>
<body>
<div id="app">
<div class="box bg-red"></div>
<div class="box bg-green float-right"></div>
<div class="box bg-blue"></div>
</div>
</body>
</html>
清除浮动 clear
清除浮动后, 虽然元素还是会脱离文档流, 但是还是会占用高度:
| 取值 | 说明 |
|---|---|
| left | 清除左浮动 |
| right | 清除右浮动 |
| both | 同事清除左右两边独浮动 |
css
#app {
border: 1px solid blue;
}
.box {
width: 100px;
height: 100px;
}
.bg-red {
background-color: red;
}
.bg-green {
background-color: green;
}
.float-right {
float: right;
}
.bg-blue {
background-color: blue;
}
.clearfix {
clear: both;
}html
<!doctype html>
<html lang="zh-cn">
<head>
<title>JavaScript</title>
<link rel="stylesheet" href="./styles.css" type="text/css" />
</head>
<body>
<div id="app">
<div class="box bg-red"></div>
<div class="box bg-green float-right"></div>
<div class="box bg-blue clearfix"></div>
</div>
</body>
</html>