img标签的水平居中、靠左、靠右

//水平靠左 
.alignleft { 
    display: inline; 
    float: left; 
} 
<img src="" class="alingleft"> 
  
//水平靠右 
.alignright { 
    display: inline; 
    float: right; 
} 
<img src="" class="alignright"> 
  
//水平居中 
.aligncenter { 
    clear: both; 
    display: block; 
    margin: auto; 
} 
<img src="" class="aligncenter">