input type="file" 上传控件的清除方法

<input type="file" name="fileName" id="fileID">
<input type="button" value="清空" onclick="clearFile()"/>

1  < script language = " javascript " >
2  function  clearFile(){
3  var  obj  =  document.getElementById( " fileID " );
4  obj.outerHTML  =  obj.outerHTML;
5  }
6  < / script>