input file 不能更改value值的解决办法
<div class="form-item" id="file-demo-wrapper"><label for="file-demo">请选择文件:www.jb51.net </label>
<input type="file" name="files"class="form-file" id="file-demo" size="40" />
</div>
$("#file-demo").remove();
//https://www.jb51.net
$("<input type=\"file\" name=\"files\"class=\"form-file\" id=\"file-demo\" size=\"40\" />").appendTo("#file-demo-wrapper");
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