parse(_$element = null)
    {
        const $element = _$element || document
        const $items = $element.querySelectorAll('.js-scroll-item:not(.scroll-item-set)')

        for(const $item of $items)
        {
            this.setItem($item)
        }
    }
Search and set js-scroll-item elements
@param {Element} _$element Target element to parse