问如何搭建域名可用性检查器？

EN

/**
 * Domain name ajax lookup
 */
$('#domainSearch form').on('submit', function (event) {
    event.preventDefault();
    const domainName = $(this).find('#domainName').val();
    const popularTld = ($(this).find('#popularTld input:checked'));
    const allTld = ($(this).find('#allTld input:checked'));
    const tld = [];
    let error = '';

    if (domainName.length <= 2) {
        error = 'Geen geldige domeinnaam';
        $(this).find('.alert').html(error);
        $(this).find('.alert').slideDown();
    } else {
        $(this).find('.alert').slideUp();
        popularTld.each(function () {
            tld.push(domainName + '.' + $(this).val());
        });
        allTld.each(function () {
            tld.push(domainName + '.' + $(this).val());
        });
        for (var i = 0; i < tld.length; i++) {
            console.log(tld[i]);
            $.get({
                url: 'https://www.name.com/domain/search/' + tld[i] + '',
                success: function (result) {
                    console.log(result);
                }
            });
        }
    }
});