html

JS:

window.onload = roll(50);
function roll(t) { 
    var ul1 = document.getElementById("comment1");
    var ul2 = document.getElementById("comment2");
    var ulbox = document.getElementById("review_box");
    ul2.innerHTML = ul1.innerHTML;
    ulbox.scrollTop = 0;
    var timer = setInterval(rollStart, t);
}
function rollStart() { 
    var ul1 = document.getElementById("comment1");
    var ul2 = document.getElementById("comment2");
    var ulbox = document.getElementById("review_box");
    if (ulbox.scrollTop >= ul1.scrollHeight) { 
        ulbox.scrollTop = 0;
    } else { 
        ulbox.scrollTop++;
    }
}

原文链接：https://blog.csdn.net/weixin_42164539/article/details/106137389

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