js无缝滚动跑马灯


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>无缝滚动跑马灯</title>
    <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
</head>
<style>
    *{
        margin:0;
        padding:0;
    }
    ul li{
        list-style:none;
    }
    .main{
        width: 300px;
        height:100px;
        margin:100px auto;
        position: relative;
        overflow: hidden;
    }
    .main li{
        float: left;
        width:100px;
        height:100px;
    }
    .main ul{
        width:300px;
        height:100px;
        position: absolute;
        left:0;
        top:0;
    }
    .main li:nth-child(odd){
        background-color: red;
    }
    .main li:nth-child(even){
        background-color: blue;
    }

</style>
<body>
    <div class="main">
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
        </ul>
    </div>
<script>
    $(".main ul").append($(".main ul").html());
    $(".main ul").width($(".main ul").width()*2);
    $(function(){

        setInterval("my_left();",10);
    });


    var left = 0;
    function my_left(){


        left -= 20;
        if(left <= -300){
            left = 0;
        }
        console.log(left);
        $('.main ul').animate({'left':left});
    }
</script>
</body>
</html>

 


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