input file 不能更改value值的解决办法

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<div class="form-item" id="file-demo-wrapper">
<label for="file-demo">请选择文件:www.phpstudy.net </label>
<input type="file" name="files[file-demo]" class="form-file" id="file-demo" size="40" />
</div>




$("#file-demo").remove();
//http://www.phpstudy.net
$("<input type=\"file\" name=\"files[file-demo]\" class=\"form-file\" id=\"file-demo\" size=\"40\" />").appendTo("#file-demo-wrapper");

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