实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>作业</title>
<style type="text/css">
.box1 {
width: 100px;
height: 100px;
background-color: lightblue;
text-align: center;
}
.box1 a {
line-height: 100px;
}
.box2 {
width: 100px;
height: 100px;
background-color: pink;
text-align: center;
display: table-cell;
vertical-align: middle;
}
.box3 {
width: 100px;
height: 100px;
background-color: pink;
display: table-cell;
vertical-align: middle;
}
.box3 .child {
width: 50px;
height: 50px;
background-color: lightblue;
margin: auto;
}
.box4 {
width: 100px;
height: 100px;
background-color: green;
text-align: center;
display: table-cell;
vertical-align:bottom;
}
.box4 ul {
margin: 0;
padding: 0;
}
.box4 li {
list-style: none;
display: inline;
}
</style>
</head>
<body>
1.子元素是行内元素:如:a,span <br>
a.水平居中:在父元素上设置: text-align:center;<br>
b.垂直居中:在行内子元素上设置行高与父元素相同: line-height
<div class="box1">
<a href="">我爱PHP</a>
</div>
<hr>
2. 子元素是多行内联文本
a.水平居中:父元素设置text-align:center
b.垂直居中:父元素设置:display:table-cell;vertical-align:middle
<div class="box2">
<span>我爱PHP</span><br>
<span>php爱我</span>
</div>
<hr>
3. 子元素是块元素:<br>
a.水平居中:子元素设置左右自动: margin: auto;<br>
b.垂直居中:与多行内联文本处理方式一致:display:table-cell;vertical-align:middle
<div class="box3">
<div class="child"></div>
</div>
<hr>
4. 子元素是不定宽的块元素:最常见的分页导航<br>
a.水平居中:子元素转行内元素,父元素加:text-align:center <br>
b.垂直居中:可给分页的ul加行高line-height=parent.height
c.底边居中:更为常用,与多行内联文本垂直处理方式一致,vertical-align:bottom;
<div class="box4">
<ul>
<li><a href="">1</a></li>
<li><a href="">2</a></li>
<li><a href="">3</a></li>
<li><a href="">4</a></li>
<li><a href="">5</a></li>
</ul>
</div>
</body>
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