在html中增加css样式有三种：
1.在标签中增加style属性：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<!--tag标签的图标-->
<link rel="shortcut icon" href="timg.jpg">
</head>
<body>
<div style="background-color: blue ;width: 80px;height: 80px "></div>
</body>
</html>
2.
第二种可以在head中增加style标签 style中通过选择器定位标签增加style样式
css选择器：
id选择器：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
/*id选择器*/
/*#代表id，#i1代表定位到class为i1的元素*/
#i1{
background-color: #000000;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<!--id在html只允许出现一个同名id-->
<div id="i1"></div>
</body>
</html>
class选择器：最常用
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
/*class选择器*/
/*.代表class，.c1代表定位到class为c1的元素*/
.c1{
background-color: #000000;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<div class="c1"></div>
</body>
</html>
标签选择器：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
/*标签选择器*/
/*所有的div的标签都带有下面属性*/
div{
background-color: pink;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<div class="c1"></div>
<div></div>
</body>
</html>
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
div{
background-color: pink;
width: 80px;
height: 80px;
}
.c1{
background-color: blue;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<div class="c1"></div>
<div></div>
</body>
</html>
层级选择器：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
/*层级选择器*/
div span{
background-color: red;
width: 80px;
height: 80px;
}
#i1 span{
background-color: blue;
width: 80px;
height: 80px;
}
.c1 span{
background-color: pink;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<div class="c1">
<span>这是span标签</span>
</div>
<div id="i1">
<span>这是span标签</span>
</div>
<div>
<span>层级选择器</span>
</div>
</body>
</html>
多个标签引用同一个标签：
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<style>
/*多个标签引用同一个标签*/
#i1,#i2,#i3{
background-color: blue;
width: 80px;
height: 80px;
}
.c1{
background-color: pink;
width: 80px;
height: 80px;
}
</style>
</head>
<body>
<div id="i1"></div><br>
<div id="i2"></div><br>
<div id="i3"></div>
<div class="c1"></div>
<div class="c1"></div>
<div class="c1"></div>
</body>
</html>
3. 在head里面使用link引入css样式表：
css表：c1.css
.c1{
background-color:red;
width: 80px;
height: 80px;
}
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>天蓝蓝</title>
<link rel="stylesheet" href="c1.css">
</head>
<body>
<div class="c1"></div>
<div class="c1"></div>
</body>
</html>
样式表的引用顺序联系：
css表：c2.css
.c1{
background-color: pink;
width: 100px;
height: 100px;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!--<link rel="stylesheet" href="c2.css">-->
<style>
/*样式表的引用关系，以标签为起的位置，由下而上的开始应用*/
.c1{
background-color: red;
width: 100px;
height: 100px;
}
</style>
<link rel="stylesheet" href="c2.css">
</head>
<body>
<div class=‘c1‘ style="background-color: #0000CC;width: 100px;height: 100px"></div>
</body>
</html>
原文地址：https://www.cnblogs.com/wxcx/p/8684809.html
时间： 2024-12-10 16:06:09