1、单行垂直居中
 
文字在层中垂直居中vertical-align 属性是做不到的.我们这里有个比较巧妙的方法就是:设置height的高度与line-height的高度相同!
 

<div style="line-height:500px;height:500;"></div>
 

2、层水平居中
 
设置div的宽度小于父div的宽度,设置 margin:0 auto;,即可让div居中。
 

#parentdiv
 {
 width: 500px;
 }
 #childdiv {
 width: 200px;
 margin:0 auto;
 }
 

3、层中的文字水平居中
 
在childdiv的css加上text-align:center;
 

#parentdiv
 {
 width: 500px;
 }
 #childdiv {
 width: 200px;
 margin:0 auto;
 text-align:center;
 }
 

4、div层垂直居中
 

<div style="width:275px;height:375px;border: solid red;">
 <div style=" background:green;height: 375px; width: 275px; position: relative; display: table-cell; vertical-align: middle;">
      <div style=" background:red;position:static;position:absolute\9; top: 50%;">
         <div style=" background:blue;position: relative; top: -50%;">
                      51xuediannao.com         </div>
       </div>
    </div>
 </div>
 

5、div层垂直水平居中,英文超长换行
 

   <div style="float:left;width:275px;height:375px;border: solid red;">
 <div style=" height: 375px; width: 275px; position: relative; display: table-cell; vertical-align: middle;">
           <div style="position:static;position:absolute\9; top: 50%;">
            <div style="position: relative; top: -50%; text-align: center;">
               <div style="width: 85px;WORD-WRAP: break-word;TABLE-LAYOUT: fixed;word-break:break-all;margin:0 auto;">
             www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn           </div>
                     
               </div>
           </div>
          </div>
 </div>
 

6、div垂直滚动
 <div style="width: 160px; height: 260px; overflow-y: scroll; border: 1px solid;">http://www.51xuedeiannao.com </div>
 

7、垂直居中和使用text-align水平居中
 

<div style="float:left;width:275px;height:375px;border: solid red;">
 <div style=" height: 375px; width: 275px; position: relative; display: table-cell; vertical-align: middle;">
           <div style="position:static;position:absolute\9;top: 50%;">
            <div style="position: relative; top: -50%; text-align:center;">
             <div style="width: 275px;">
                       <div style="width: 160px;WORD-WRAP: break-word;TABLE-LAYOUT: fixed;word-break:break-all;text-align:left;">
            设计之家设计之家设计之家设计之家设计之家设计之家设计之家设计之家
               </div>
               </div>
                     
               </div>
           </div>
          </div>
 </div>
 

8、垂直居中和使用margin水平居中
 

    <div style="float:left;width:275px;height:375px;border: solid red;">
 <div style=" height: 375px; width: 275px; position: relative; display: table-cell; vertical-align: middle;">
           <div style="position:static;position:absolute\9; top: 50%;">
            <div style="position: relative; top: -50%; ">
            
                       <div style="margin:0 auto;width: 160px;WORD-WRAP: break-word;TABLE-LAYOUT: fixed;word-break:break-all;">
             www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn www.sj33.cn
               </div>
             
                     
               </div>
           </div>
          </div>
 </div>

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