php+js实现极验拖动验证码,如何实现拖动滑块匹配图形的验证方式,PHP+js弹出滑动验证码源码和DEMO

远程验证拖动是否正确
require_once dirname(__FILE__).'/TnCode.class.php';
$tn = new TnCode();
if($tn->check()){
$_SESSION['tncode_check'] = 'ok';
echo "ok";
}else{
$_SESSION['tncode_check'] = 'error';
echo "error";
}
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