<form action="${basePath}/teacher/problem/upPPt" method="post" enctype="multipart/form-data" target="nm_iframe">
<a href="javascript:;" class="file">选择文件
<input type="file" name="file" id="ppt">
</a>
<input type="text" value="${courseNote.id }" name="courseNoteId" style="display:none;" >
<button class="ui button" type="submit">上传</button>
</form>
<iframe id="id_iframe" name="nm_iframe" style="display:none;"></iframe>
iframe中的name与form表单中的target相同
