Леонид Князев

<option value="217" data-price="2000" data-compare-price="2400">ОФД на 12 месяцев 2000р.</option>
<option value="218" data-price="2400" data-compare-price="3000">ОФД на 15 месяцев 2400р.</option>
<option value="219" data-price="4500" data-compare-price="6500">ОФД на 36 месяцев 4500р.</option>

This rule enforces consistent line breaks inside braces of object literals or destructuring assignments.

const {
  parallel, src, dest, watch
} = require('gulp');

$(".map-show").hover(function () {
        var map = $(this).attr("data-map");
        var map_width = $(window).width();
        var map_height = $(this).attr("data-map-height");
        $(this).css("height", map_height);
        if (map_width > window) { map_width = window; }
        $(this).html('<iframe src="' + map + '" width="' + map_width + '" height="' + map_height + '" frameborder="0" style="border:0" allowfullscreen></iframe>');

        $(this).off('mouseenter mouseleave');
});

const elems = document.querySelectorAll('[id^=elem-]');

const str = 'Hello! Wor!ld!';
document.write(str.replace(/!/g, ''));

Compiling in the browser has a fairly limited use case, so if you are working on a production site you should be precompiling your scripts server-side.

Автоматическая загрузка при прокрутке. Можно ли такое сделать?

Если да то как?