<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>无缝滚动</title>
<style>
.scroll-no-gap {
width: 300px;
height: 100px;
position: relative;
overflow: hidden;
} .scroll-no-gap .ul-scroll {
list-style: none;
margin: 0;
padding: 0;
height: 100px;
width: 100px;
position: absolute;
left: 0;
top: 0;
} .scroll-no-gap .ul-scroll li {
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
float: left;
} .scroll-no-gap .ul-scroll li:nth-child(even) {
background-color: rosybrown;
} .scroll-no-gap .ul-scroll li:nth-child(odd) {
background-color: aquamarine;
}
</style>
</head>
<body>
<!--无缝滚动-->
<div class="scroll-no-gap">
<ul class="ul-scroll">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
<li>9</li>
</ul>
</div>
<button class="prev">prev</button>
<button class="next">next</button>
<script>
//无缝滚动
//取值：oDiv.offsetLeft(可读写) ==>字符串
//设置值： oDiv.style.left（只读） ==> 数值
var oUl = document.getElementsByClassName('ul-scroll')[0];
var aLi = oUl.getElementsByTagName('li');
//console.log(aLi.length);
oUl.style.width = aLi.length * 100 + 'px';
//console.log(oUl.offsetWidth);
var oPrev = document.getElementsByClassName('prev')[0];
var oNext = document.getElementsByClassName('next')[0];
var now = 0;
oNext.onclick = function(){
now = now + 1;
oUl.style.left = oUl.offsetLeft - 300 + 'px';
if(now == 3){
oUl.style.left = 0;
now = 0;
}
};
oPrev.onclick = function(){
now = now - 1;
oUl.style.left = oUl.offsetLeft + 300 + 'px';
if(now == -1){
now = 2;
oUl.style.left = -(aLi.length/3 - 1)*300 + 'px';
}
}; </script>
</body>
</html>