a lot of FileUpload component, how to distinguish

[Gourdbaby]

the code following

<li><i>2、考场记录单</i>
	<FileUpload ref="fileUpload1" options={fileupload}>
               <button ref="chooseAndUpload">上传附件</button>
        </FileUpload>
</li>
<li><i>3、考场纪律</i>
	<FileUpload ref="fileUpload2" options={fileupload}>
		<button ref="chooseAndUpload">上传附件</button>
	</FileUpload>
</li>
<li><i>4、企业logo</i>
	<FileUpload options={fileupload}>
		<button ref="chooseAndUpload">上传附件</button>
	</FileUpload>
</li>

this code has three fileUpload component,
when the user upload filing, how can i make sure the user click anyone fileUpload;