Bootstrap修改input file默认样式

html部分

---

<div class="form-group">
    <label class="col-sm-3 control-label">选择数据文件</label>
    <div class="input-group">
        <input id="docPath" type="text" class="form-control">
        <span id="scan" style="position: relative" class="btn btn-primary input-group-addon">浏览<input id="path" style=" 60px;height:40px; position: absolute;top:-6px;left: -4px;opacity: 0; filter:alpha(opacity=0)" class="form-control" type="file"></span>
    </div>
</div>

JavaScript部分

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$("#path").change(function () {
    $("#docPath").val($(":file").val());
});