HTML 元素如何浮动?
我们可以使用 CSS 的 float 属性将元素浮动到包含父元素的左侧或右侧。其他元素会围绕浮动内容放置。具有相同 float 属性值的多个元素都并排放置。
左浮动
在这个例子中,图像使用 float 属性和 left 值放置在左侧。为了正确设置右侧边距,我们使用 margin-right 属性设置它 -
img {
float: left;
margin-right:20px;
}
示例
让我们看一个将元素左浮动的示例 -
<!DOCTYPE html>
<html>
<head>
<style>
img {
float: left;
margin-right:20px;
}
</style>
</head>
<body>
<h1>Demo Heading</h1>
<p>In this example, the image will float to the left in the text, and the text in the paragraph will wrap around the image.</p>
<p><img src="https://tutorialspoint.com/sql/images/sql-mini-logo.jpg" alt="SQL">
SQL is a database computer language designed for the retrieval and management of data in a relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc. SQL stands for Structured Query Language. SQL was developed in the 1970s by IBM Computer Scientists.</p>
</body>
</html>
右浮动
在这个例子中,图像使用 float 属性和 right 值放置在右侧。为了正确设置左侧边距,我们使用 margin-left 属性设置它 -
img {
float: right;
margin-left:20px;
}
示例
让我们看看将元素右浮动的示例 -
<!DOCTYPE html>
<html>
<head>
<style>
img {
float: right;
margin-left:20px;
}
</style>
</head>
<body>
<h1>Demo Heading</h1>
<p>In this example, the image will float to the left in the text, and the text in the paragraph will wrap around the image.</p>
<p><img src="https://tutorialspoint.com/sql/images/sql-mini-logo.jpg" alt="SQL">
SQL is a database computer language designed for the retrieval and management of data in a relational databases like MySQL, MS Access, SQL Server, Oracle, Sybase, Informix, Postgres etc. SQL stands for Structured Query Language. SQL was developed in the 1970s by IBM Computer Scientists.</p>
</body>
</html>
左右浮动
在这个例子中,我们展示了如何使用 CSS Float 属性。这里,<button> 元素使用 float 属性的 left 和 right 值分别设置在左侧或右侧。我们设置了一个 flex 布局。初始 flex-items 使用 align-items 属性设置为居中 -
示例
<!DOCTYPE html>
<html>
<head>
<title>CSS Float</title>
<style>
form {
width:70%;
margin: 0 auto;
text-align: center;
}
input[type="button"] {
border-radius: 10px;
}
#container {
display: flex;
flex-direction: column-reverse;
justify-content: center;
align-items: center;
}
.child{
height: 40px;
width: 40px;
color: white;
border: 4px solid black;
}
.orange{
background-color: #FF8A00;
}
.red{
background-color: #F44336;
}
.violet{
background-color: #C303C3;
}
.green{
background-color: #4CAF50;
}
.blue{
background-color: #03A9F4;
}
.yellow{
background-color: #FEDC11;
}
#left{
display: flex;
float: left;
}
#right{
display: flex;
float: right;
}
</style>
</head>
<body>
<form>
<fieldset>
<legend>CSS-Float</legend>
<div id="container">
<div class="child orange"></div><div class="child red"></div><div class="child violet"></div><div class="child green"></div><div class="child blue"></div><div class="child yellow"></div>
</div><br>
<input type="button" value="float-->left" onclick="floatDecider('left')">
<input type="button" value="float-->right" onclick="floatDecider('right')">
<div><div id="left"></div><div id="right"></div></div>
</fieldset>
</form>
<script>
var left = document.getElementById('left');
var right = document.getElementById('right');
function floatDecider(direction){
var allChildren = document.getElementsByClassName('child');
if(direction === 'left')
left.insertAdjacentElement('beforeend',allChildren[0]);
else
right.insertAdjacentElement('afterbegin',allChildren[0]);
}
</script>
</body>
</html>
广告
数据结构
网络
关系数据库管理系统
操作系统
Java
iOS
HTML
CSS
Android
Python
C 编程
C++
C#
MongoDB
MySQL
Javascript
PHP