01-text-decoration
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.baidu {
text-decoration: underline;
cursor: pointer;
}
.google {
text-decoration: line-through;
}
.binying {
text-decoration: overline;
}
</style>
</head>
<body>
<!-- a元素默认有添加text-decoration -->
<a href="http://www.baidu.com">百度一下</a>
<!-- span元素添加下划线 -->
<span class="baidu">百度一下</span>
<!-- 装饰线其它的值 -->
<span class="google">谷歌一下</span>
<span class="binying">必应一下</span>
</body>
</html>
效果如下
02-text-align
2.1 常用值
2.2 直接翻译
是设置文本的对齐方式 但是可以让图片居中,这个解释就不是那么合适
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
background-color: red;
color: white;
height: 200px;
text-align: center;
}
img {
width: 100px;
}
</style>
</head>
<body>
<div class="box">
<img src="./images/diqiu.jpg" alt="图片">
</div>
</body>
</html>
效果如下
2.3 MDN解释
定义行内内容(例如文字)如何相对它的块父元素对齐 用2个div元素演示(div是块级元素) 设置居中发现并没有居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
background-color: red;
height: 300px;
}
.content {
background-color: green;
height: 200px;
width: 200px;
}
</style>
</head>
<body>
<div class="box">
<div class="content"></div>
</div>
</body>
</html>
效果如下
用属性text-align设置居中,可以发现这个绿色的盒子没有居中
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
background-color: red;
height: 300px;
/* 设置居中没有起到效果,可以发现这个解释不合理 */
text-align: center;
}
.content {
background-color: green;
height: 200px;
width: 200px;
}
</style>
</head>
<body>
<div class="box">
<div class="content"></div>
</div>
</body>
</html>
效果如下
所以MDN对这个属性的解释也不是那么准确
2.4 官方解释
这也就能解释为什么上述的实验中为什么没有居中的原因,div是一个块级元素
改变元素的属性
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
background-color: red;
height: 300px;
text-align: center;
}
.content {
background-color: green;
height: 200px;
width: 200px;
display: inline-block;
}
</style>
</head>
<body>
<div class="box">
<div class="content"></div>
</div>
</body>
</html>
效果如下