仅限制xls文件上传
<input id="uploadSkufile" type="file" value="批量导入" style="float:left" name="uploadSkufile" accept="application/vnd.ms-excel">
仅限制xlsx文件上传
<input id="uploadSkufile" type="file" value="批量导入" style="float:left" name="uploadSkufile" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
同时限制xls文件和xlsx文件两种，以逗号分隔， 补充accept属性值即可
<input id="uploadSkufile" type="file" value="批量导入" style="float:left" name="uploadSkufile" accept="application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">