input='file'样式重置

<style type="text/css">
    .fileinput-button {
    position: relative;
    display: inline-block;
    overflow: hidden;
    display: block;width: 130px;
    height: 30px;
    border: 1px solid #c5c5c5;
    line-height: 30px;
    font-size: 14px;
}
.fileinput-button input{
    position: absolute;
    left: 0px;
    top: 0px;
    opacity: 0;
    -ms-filter: 'alpha(opacity=0)';
}
</style>
<div><span class="fileinput-button"><span>加载附件</span><input type="file"></span></div>