浏览器兼容的文件上传

.input-group{
    position: relative;
    display: table;
    border-collapse: separate;
    width: 90%;
}
.input-group-btn{
vertical-align: middle;
}
.btn-file{
   position: relative;
   overflow: hidden;
}
.btn-file input[type=file]{
position: absolute;
    top: 0;
    right: 0;
    min-width: 100%;
    min-height: 100%;
    text-align: right;
    filter:alpha(opacity=0);
    -moz-opacity:0;
    opacity: 0;
    background: 0 0;
    cursor: inherit;
    display: block;

}

code="select.file" />*