JS JavaScript 实现文字上下滚动效果

    
Lorem ipsum dolor sit amet.
    
Amet hic ipsum offices vitae!
    
Debits quart qua sapient venial.
    
Ilium nobs object oddity sapient?
    
Et laudanum nemo official omnibus.
    
Lorem ipsum dolor sit amet.
    
Dolore hic magnam nemo quasi.
    
Expedita nemo non optio performed?
    
Asperities culpa impedit in quos.
    
Cumque illum performed similique volutes.
    
Lorem ipsum dolor sit amet.
    
Eveniet optio, vitae. Fuga, illum.
    
Diagnosis fugiat laborum officiis quibusdam?
    
Cumque neque qua tempora volutes?
    
Lorem ipsum dolor sit amet.
    
Consecrated incidunt quo rem voluptatem.
    
Culpa distinctio natus pariatur velit.
    
Dolores neque similique sint ut!
    
Accuses esse itaque nihil rescinds.
    
Lorem ipsum dolor sit amet.
    
Fugit iure nesciunt placeat poor.
    
Aperiam atque cupidity numquam rescinds!
    
Illum molest officia sed veniam!
    
Enum fugiat in labore optio?

css样式代码

#scroll {
            margin: 0;
            padding: 2px 0;
            list-style: none;
            width: 300px;
            height: 200px;
            overflow: hidden;
            border: 1px #e5e5e5 solid;
            font-size: 16px;
            color: #f0f0f0;
            background-image: url("../images/p.png");
        }
 
        #scroll li {
            margin: 0;
            padding: 0 4px;
            font-size: 12px;
            height: 18px;
            line-height: 18px;
            width: 600px;
        }

方法：

dMarquee(id) {
                let speed = 20; //速度
                let stop = 1000; //停止时间
 
                let ul = document.getElementById(id);//获取ul元素
                let rows = ul.getElementsByTagName('li').length;//获取li个数
                let height = ul.getElementsByTagName('li')[0].offsetHeight;//取得第一个li的高度
                ul.innerHTML += ul.innerHTML;//获取所有li
                let timeID = false;//setTime的时间标示
                let play = function () { //移动方法
                    ul.scrollTop++;//移动滚动条
                    //移动到底的时候恢复为零
                    if (ul.scrollTop === rows * height) {
                        ul.scrollTop = 0;
                    }
                    //每次滚动
                    if (ul.scrollTop % height === 0) {
                        timeID = setTimeout(play, stop);
                    } else {
                        timeID = setTimeout(play, speed);
                    }
                }
                timeID = setTimeout(play, stop);
                ul.onmouseover = function () {
                    clearTimeout(timeID);
                }
                ul.onmouseout = play;
            }