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基于JavaScript实现新增内容滚动播放效果附完整代码

2019-11-19 15:41:38
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先给大家展示下效果图:

完整demo如下

每两秒随机向上或者向下滚动,如果要替换新内容,则通过html()更新内容即可(查看注释代码)

<!DOCTYPE html><head>  <meta name="viewport" content="width=device-width, initial-scale=1.0">  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>  <style>    ul,li{      list-style-type:none;      border: solid;    }    ul{      overflow: hidden;/*让li超出ul时隐藏*/    }    body{      margin: 0px;    }  </style></head><body><div>  <ul>    <li>      <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1503543418892&di=1f606f0990cf6fa893c8330457b5fde2&imgtype=0&src=http%3A%2F%2Fi3.hoopchina.com.cn%2Fblogfile%2F201509%2F16%2FBbsImg144240668814516_480*360.jpg"/>    </li>    <li><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1503543451619&di=a578daa6b6f794cb233f655cd5ecaf91&imgtype=0&src=http%3A%2F%2Fimg.qqzhi.com%2Fupload%2Fimg_0_3518803618D2241430362_23.jpg"/>    </li>    <li><img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1503544550636&di=086d271111b428fadf9e23abb7c06b1e&imgtype=0&src=http%3A%2F%2Fuploads.yeyoujia.com%2Fcms%2Fimages%2F2017%2F02%2F10%2F589d8e4598d46285900450.png">    </li>  </ul></div><script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script><script>  function getRandom(min, max){    var r = Math.random() * (max - min);    var re = Math.round(r + min);    re = Math.max(Math.min(re, max), min)    return re;  }  $(function(){    setInterval(function(){      if(getRandom(0,1)==0){        //向上滚动特效        var ul = $("ul");        var $first = ul.find('li:first');        var height = $first.height();        $first.animate({          marginTop: -height + 'px'        }, 500, function() {//          $first.css('marginTop', 0).html(new Date().getMinutes()+":"+new Date().getSeconds()).appendTo(ul);/*不要写成append*/          $first.css('marginTop', 0).appendTo(ul);        });      }else{        //向下滚        var ul = $("ul");        var liHeight = ul.find("li:last").height();//计算最后一个li元素的高度        ul.animate({marginTop : liHeight +"px"},500,function(){//          ul.find("li:last").html(new Date().getMinutes()+":"+new Date().getSeconds()).prependTo(ul);/*不要写成prepend*/          ul.find("li:last").prependTo(ul);/*不要写成prepend*/          ul.find("li:first").hide();          ul.css({marginTop:0});          ul.find("li:first").fadeIn(1000);        });      }    },2000);  });</script></body></html>

效果

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