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php+js實現極驗拖動驗證碼，如何實現拖動滑塊匹配圖形的驗證方式，PHP+js彈出滑動驗證碼源碼和DEMO

遠程驗證拖動是否正確

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";
}