Detailed explanation of using backgroundImage to solve the image carousel switching

  /**
        * Play picture */
    function playImage(src) {
        if (animaitionFinshed) return;
        if (!_imageEl) {
            _imageEl = document.createElement('div')
            _imageEl.className = `swiper_container`;
            _imageEl.style.backgroundImage = `url(${src.url})`;
            _imageEl.setAttribute("data-img", src.url);
            elContainer.appendChild(_imageEl);
        } else {
            animaitionFinshed = true;
            let width = elContainer.clientWidth, height = elContainer.clientHeight;
            let preImage = _imageEl.getAttribute("data-img");
            _imageEl.style.backgroundImage = `url(${preImage}),url(${src.url})`;
            _imageEl.style.backgroundPositionX = `center,${width + 20}px`;
            setTimeout(() => {
                _imageEl.style.transition = "all 0.8s ease";
                _imageEl.style.backgroundPositionX = `-${width + 20}px,center`;
            }, 0);

            setTimeout(() => {
                _imageEl.style.transition = "none";
                _imageEl.style.backgroundImage = `url(${src.url}) `;
                _imageEl.style.backgroundPositionX = `center`;
                _imageEl.setAttribute("data-img", src.url)
                animaitionFinshed = false;
            }, 800)
        }
    }