Uncaught InvalidStateError: Failed to set the 'value' property on 'HTMLInputElement': This input element accepts a filename, which may only be programmatically set to the empty string.
使用 HTML5 的图片上传api的时候报如下错误：
Uncaught InvalidStateError: Failed to set the 'value' property on 'HTMLInputElement': This input element accepts a filename, which may only be programmatically set to the empty string.
出现这个bug的原因是，input元素 blur的时候，需要将上次图片的input元素的value设置为空字符串，就不会报错了。
http://stackoverflow.com/questions/29720794/jquery-select-input-file-and-also-set-it-to-another-input
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