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在css中要实现内容垂直居中我们的css有个vertical-align: middle;
属于，但是一般情况下是没有效果的，下面我们来看解决办法。div水平居中很容易，设置css样式 text-align: center;
就可以了。垂直居中也有个属性 vertical-align: middle; 这个属性普通设置是没有效果的。
第一种方法：通过一个空白图片可以达到垂直居中的效果
代码如下：
图片居中
/*定义垂直居中*/
#test * {
margin: 0px;
padding: 0px;
vertical-align: middle;
}
/*定义div大小，以及水平居中*/
#test {
background: #fff000;
width: 500px;
height: 500px;
text-align: center;
}
/*辅助图片高度填满div，宽度为0，所以看不到这个图片*/
#img {
width: 0px;
height: 100%;
}
个人觉得vertical-align: middle 是相对于左边的高度垂直居中的，我给左边一个填满div的图片，就可以实现垂直居中了。
第二种方法：往div里面加表格。
代码如下：
#a {
background: #fff000;
width: 500px;
height: 500px;
overflow: hidden;
text-align: center;
}
在表格里就很容易设置居中了。
经测试，这两种做法都没有浏览器不兼容的问题。推荐用第一种方法。
另外，说一下overflow: hidden; 这个属性，当图片大小超出div的大小时，会影藏超出的部分。不设置的话，图片会全部显示，覆盖在div上。
