<input name=\"filesize\" type=\"text\" id=\"filesize\" value=\"<?=$ecmsfirstpost==1?\"\":ehtmlspecialchars(stripSlashes($r[filesize]))?>\" size=\"60\">
<select name=\"select\" onchange=\"document.add.filesize.value+=this.value\">
        <option value=\"\">单位</option>
        <option value=\" MB\">MB</option>
        <option value=\" KB\">KB</option>
        <option value=\" GB\">GB</option>
        <option value=\" BYTES\">BYTES</option>
      </select>