无法将类别添加到img标签

Question

我在图像转盘中有3张幻灯片，并且我想将class id动画和bounceInDown添加到具有Ids melon-fruta，frutilla-fruta和banana-fruta的3个img标签中，当我在控制台中记录该元素时，工作正常，但在开发人员工具的“元素”选项卡中，属性未显示在img标签中。

var owl = $('.carrousel .owl-carousel');
    owl.owlCarousel();
        // Listen to owl events:
    owl.on('changed.owl.carousel', function (event) {
        var page = event.page.index;
        if(page == 0){
            console.log(page);
            const element = document.getElementById("melon-fruta");
            element.classList.add('animated', 'bounceInDown','delay-1s');
            console.log(element);
        }else if(page == 1){
            const element = document.getElementById("frutilla-fruta");
            element.classList.add('animated', 'bounceInDown','delay-1s');
            console.log(element);
        }else if(page == 2){
            const element = document.getElementById("banana-fruta");
            element.classList.add('animated', 'bounceInDown','delay-1s');
            console.log(element);
        }

    });