IE11，解决载入时验证码不刷新：dayrui\Fcms\Core\Helper.php

找到function dr_code($width, $height, $url = '') 修改为

function dr_code($width, $height, $url = '') {

    $url = dr_web_prefix('index.php?s=api&c=api&m=captcha&width='.$width.'&height='.$height.'&ran='.mt_rand(100000, 999999));

    return '<img align="absmiddle" style="cursor:pointer;" onclick="this.src=\''.$url.'&t=\'+Math.random();" src="'.$url.'" />';

}