本文实例讲述了JS实现的点击按钮图片上下滚动效果。分享给大家供大家参考，具体如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0;
padding:0;
list-style: none;
}
.big{
width: 200px;
height: 200px;
margin:100px auto;
}
ul{
width: 100px;
height: 100px;
border: 1px solid black;
position: relative;
overflow: hidden;
}
li{
width: 100px;
height: 100px;
line-height: 100px ;
text-align: center;
}
.color1{
background: red;
position: absolute;
}
.color2{
background: yellow;
position: absolute;
}
.color3{
background: pink;
position: absolute;
}
.color4{
background: green;
position: absolute;
}
.input1{
width: 30px;
height: 30px;
margin: 10px ;
position: absolute;
top:150px ;
left:550px;
}
.input2{
width: 30px;
height: 30px;
margin: 10px ;
position: absolute;
top:150px ;
left:590px;
}
</style>
</head>
<body>
<div class="big">
<ul>
<li class="color1" style="top:0;">1</li>
<li class="color2" style="top:100px;">2</li>
<li class="color3" style="top:200px;">3</li>
<li class="color4" style=" top:-100px;">4</li>
</ul>
<input class="input1" type="button" value="1">
<input class="input2" type="button" value="2">
</div>
<script>
window.onload=function () {
var oIpt1=document.getElementsByTagName("input")[0];
var oIpt2=document.getElementsByTagName("input")[1];
var allColor=document.getElementsByTagName("li");
oIpt2.addEventListener("click",function () {
for(var i=0;i<allColor.length;i++){
allColor[i].style.top=parseFloat(allColor[i].style.top)-100+"px";
allColor[i].style.transition=1+"s"
if(allColor[i].style.top==-300+"px"){
allColor[i].style.top=100+"px"
allColor[i].style.transition=0+"s"
}
}
},false)
oIpt1.addEventListener("click",function () {
for(var i=0;i<allColor.length;i++){
allColor[i].style.top=parseFloat(allColor[i].style.top)+100+"px";
allColor[i].style.transition=1+"s"
if (allColor[i].style.top==400+"px"){
allColor[i].style.top=0+"px"
allColor[i].style.transition=0+"s"
}
}
},false)
}
</script>
</body>
</html>
这里使用在线HTML/CSS/JavaScript代码运行工具：http://tools.softyun.net/code/HtmlJsRun测试上述代码，可得如下运行结果：
希望本文所述对大家JavaScript程序设计有所帮助。
