HTML-CSS-/无缝滚动.html at master · suncpp/HTML-CSS- · GitHub

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无缝滚动</title>
<style type="text/css">
*{margin:0;padding:0;}
#div2{width:600px;overflow:hidden;position:relative;left:200px;}
#div1{position:relative;left:0px;width:1200px;}
#div1 li{list-style-type: none;float:left;width:200px;height:180px;
}
img{width:100%;height:100%;}
</style>
<script>
window.onload=function(){
    var oUl=document.getElementById('ul1');
    var oDiv=document.getElementById('div1');
    var oBtn=document.getElementById('btn1');
    var t=0;
    oUl.innerHTML = oUl.innerHTML + oUl.innerHTML;

    var speed = 20;//速度，必须是oUl.offsetWidth能整除的数；
    oBtn.onclick=function(){
        clearInterval(t);
        t=setInterval(function(){
            if(oDiv.offsetLeft <= -oUl.offsetWidth/2){
                oDiv.style.left = -speed+'px';//因为判断的时候已经到了边界了，所以应该执行下次
            }else{
                oDiv.style.left = oDiv.offsetLeft - speed+'px';
            }
        },50);
    }
}
</script>
</head>
<body>
<input id="btn1" value="开始" type="button"/>
<div id="div2">
    <div id="div1">
        <ul id="ul1">
            <li><img src="1.jpg"></li>
            <li><img src="2.jpg"></li>
            <li><img src="3.jpg"></li>
        </ul>
    </div>
</div>
</body>
</html>