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请问上传的时候有办法指定文件存储的后缀吗

之前看到有朋友讨论说可能会加这样的魔法变量，请问现在有了吗，看文档里还没有呢
因为文件上传后，文件名肯定是唯一的，我这不前端不希望再去弄套规则生成唯一文件名了，如果能直接传一个文件后缀就好了，或者说不传key默认就是上传文件的后缀名就好了 : )

please add jsonp callback parameter 

<iframe id='callback-iframe'  src='/callback.html' frameborder='0' width='0' height='0'></iframe>
<form method="post" action="http://up.qiniu.com/" enctype="multipart/form-data" target='callback-iframe'>
  <input name="key" type="hidden" value="<Your file name in qiniu>">
  <input name="x:<custom_field_name>" type="hidden" value="<Value of your custom param>">
  <input name="token" type="hidden" value="<Your uptoken from server>">
  <input name="file" type="file"/>
 <input name="jsonp" type="hidden" value="<custom javascript function name>">
</form>

低级浏览器不支持ajax上传文件时，要用iframe来做无刷新处理，此时如果七牛api支持JSONP格式应答，可以把key和hash及其他应答传递给用户自定义的jsonp callback函数。

预期应答如下：

Content-Type : application/javascript

body:  
xyzJavascriptCallbackFunction({ /*xyzJavascriptCallbackFunction is the jsonp parameter's value*/
   'key' : 'adhsaljfhdlskf',
   'hash' : 'shflsdfhldshflsd'
   //,.....
});

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