如果您有货币代码列表，您可以通过它们并调用:

If you have list of currency codes you can just go through them and call:

    public function getCurrenciesAction()
{
    $currencies = array('EUR', 'USD'); //here you need to retrieve your currencies list
    $symbols = array();
    foreach ($currencies as $currency) {
        $symbols[$currency] = $symbol = Intl::getCurrencyBundle()->getCurrencySymbol($currency);
    }
    return new JsonResponse($symbols);
}

然后您可以从整个列表生成 JSON 数组，并通过 AJAX 请求在 JavaScript 中检索它.

You can then generate JSON array from the whole list and retrieve it in JavaScript via AJAX request.