自定义button上传按钮

<div class="upload_files">

    <input type="file" class="upload_icon" value="上传文件">

    <i></i>

    <p></p>

</div>

.upload_files{

  position: relative;

  overflow: hidden;

}

.upload_icon{

   position:absolute;

   display:block;

   outline:none;

   filter:alpha(opacity=);

   -moz-opacity:;

   opacity:;

   z-index:;

   width:250px;

   height: 50px;

   font-size:100px;

}

.upload_icon + i{

  display:block;

  float:left;

  width:260px;

  height: 50px;

  background:  url();

  margin-top:-2px;

  cursor:pointer;

}