html代码布局,需要用到定位,不细说了
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
font-size: 12px;
} #Div {
width: 100px;
height: 300px;
margin: 100px auto 0;
position: relative;
overflow: hidden;
} #ptoBox {
width: 100px;
height: 400px;
top: -100px;
position: absolute;
} #ptoS {
list-style-type: none;
} .base {
width: 100px;
height: 100px;
} .base1 {
background: red;
} .base2 {
background: blue;
} .base3 {
background: pink;
} .base4 {
background: red;
} #btn1 {
position: absolute;
width: 30px;
height: 20px;
background: yellow;
top: 0px;
left: 35px;
opacity: 0.5;
filter: alpha(opacity=50);
cursor: pointer;
} #btn2 {
position: absolute;
width: 30px;
height: 20px;
background: yellow;
bottom: 0px;
right: 35px;
opacity: 0.5;
filter: alpha(opacity=50);
cursor: pointer;
}
</style>
</head> <body id="one">
<div id="Div">
<div id="ptoBox">
<ul id="ptoS">
<li class="base base3">three</li>
<li class="base base1">one</li>
<li class="base base2">two</li>
<li class="base base3">three</li>
<li class="base base4">one</li>
<li class="base base2">two</li>
<li class="base base3">three</li>
<li class="base base4">one</li>
</ul>
</div>
<span id="btn1"></span>
<span id="btn2"></span> </body> </html>
javascript的代码记得放在 body里面,也就是html代码下方
这个是垂直滚动的焦点图,用的是onmousedown,鼠标按住图片会一直循环滚动
因为同时显示三张图片,所以需要一套图片需要备两组用来循坏
<script type="text/javascript">
function $(id) {
return typeof id === "string" ? document.getElementById(id) : id;
}
//自定义变量
var Div = $("Div");
var ptoBox = $("ptoBox");
var ptoS = $("ptoS").getElementsByTagName("li");
var btnTop = $("btn1");
var btnBottom = $("btn2");
var time = null;
var index = 1; //alert("body"); //鼠标点下绑定事件
btnBottom.onmousedown = function() {
//调用自定义函数,并传参
rolling1(ptoBox, 'top', 1);
} //鼠标松开绑定事件
btnBottom.onmouseup = function() {
//清除定时器
clearInterval(timer);
//调用自定义函数,并传参
nowPto(ptoBox, 'top');
} /*body.onmouseup = function() {
clearInterval(timer);
}*/ btnTop.onmousedown = function() {
rolling(ptoBox, 'top', -1);
} btnTop.onmouseup = function() {
clearInterval(timer);
nowPto(ptoBox, 'top');
} //判定当前显示图片
function nowPto(obj, iStyle) {
//获得传入参数的属性的数值
var iTop = parseInt(getStyle(obj, iStyle));
//取余数
var value = iTop % 100;
//当余数大于-50则,显示当前整张图片
//当小于-50时,则跳过本张图片
if (value > -50) {
obj.style[iStyle] = iTop - value + 'px';
} else {
obj.style[iStyle] = iTop - (value + 100) + 'px';
}
} //自减函数
function rolling(obj, iStyle, speed) {
//设置定时器,每10毫秒执行一次
timer = setInterval(function() {
//获取当前ptoBox的top值
var iValue = parseInt(getStyle(obj, iStyle));
//当top值小于-500,则当前的top值变成-200
if (iValue <= -500) {
obj.style[iStyle] = -200 + 'px';
} else {
//否则,减少1像素
obj.style[iStyle] = iValue + speed + 'px';
} }, 10); } //自增函数
function rolling1(obj, iStyle, speed) {
//定时器
timer = setInterval(function() {
//获取当前ptoBox的top值
var iValue = parseInt(getStyle(obj, iStyle));
//当top值大于0,则当前的top值变成0
if (iValue >= 0) {
obj.style[iStyle] = -300 + 'px';
} else {
//否则,增加1像素
obj.style[iStyle] = iValue + speed + 'px';
}
}, 10); } function start() {
btnBottom.onmousedown();
} function stop() {
clearInterval(timer);
}
//鼠标进入,则清除定时器
Div.onmouseenter = stop;
//鼠标离开,则开始执行循环
Div.onmouseleave = start;
start(); function getStyle(obj, attr) {
if (obj.currentStyle) {
//currentStyle获取样式的值，对应的是ie浏览器
return obj.currentStyle[attr];
} else {
//同理，对应的是其他浏览器
return getComputedStyle(obj, false)[attr];
}
}
</script>
</div>
<script src="changfunction.js"></script>