CSS图片垂直居中实现方法详解

<div class="box">
<a class="pic-wrap" href="#" target="_blank">
<img src="https://zhanzhang360.qulang.net/imgupload/006182/T1LeeNXodaXXXXXXXX-130-150.png">
</a>
</div>

body {
margin: 0;
padding: 0;
font: 12px/1.5 tahoma,arial;
}
.box {
width: 220px;
height: 220px;
border: 1px solid #F30;
margin: 100px auto 0;
display: table;
}
.pic-wrap {
display: table-cell;
text-align: center;
vertical-align: middle;
}
/*主要针对IE6、7的hack*/
.box {
*position: relative;
}
.pic-wrap {
*width: 100%;
*position: absolute;
*top: 50%;
*left: 0;
/*继承自body的字体会影响到ie6，设置默认的windows系统字体*/
_font-family: sans-serif;
}
.pic-wrap img {
*position: relative;
*top: -50%;
*left: 0;
/*在ie中空文本节点有默认高度*/
vertical-align: middle\9;
/*在ie中，a标签中的img标签默认有蓝色边框*/
border: none\9;
}

.box {
width: 220px;
height: 220px;
border: 1px solid #F30;
margin: 100px auto 0;
}
.pic-wrap {
display: table-cell;
vertical-align: middle;
width: 220px;
height: 220px;
text-align: center;
/*ie6、7不支持display:table-cell*/
*display: block;
*font-size: 192px; /*字体大小为height*0.783或者height/1.14,这里约为192px*/
_font-family: sans-serif; /*设置字体，否则在ie6下会有一个像素的偏差*/
}
.pic-wrap img {
border: none;
vertical-align: middle; /*由于ie下空文本节点有默认高度，所以设置*/
}

body {
margin: 0;
padding: 0;
<SPAN style="COLOR: #ff6600">font: 12px/1.5 tahoma,arial;</SPAN>
}
.box {
width: 220px;
height: 220px;
border: 1px solid #F30;
margin: 100px auto 0;
}
.pic-wrap {
display: table-cell;
vertical-align: middle;
width: 220px;
height: 220px;
text-align: center;
/*ie6、7不支持display:table-cell*/
*display: block;
_font-size: 192px;
<SPAN style="COLOR: #ff6600">+line-height: 220px; /*设置ie7中空文本节点行高为220px*/</SPAN>
_font-family: sans-serif;
}
.pic-wrap img {
border: none;
vertical-align: middle\9; /*由于ie中有默认高度的空文本节点*/
}