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  • 焦点轮播图

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <title>轮播图</title>
    <style type="text/css">
    *{ margin: 0; padding: 0; text-decoration: none;}
    body{padding: 20px;}
    #container{ 600px;height: 400px;border: 3px solid #333;position: relative;overflow: hidden;margin: 0 auto;}
    #list { 4200px; height: 400px; position: absolute; z-index: 1;}
    #list img { float: left;}
    #buttons { position: absolute; height: 10px; 100px; z-index: 2; bottom: 20px; left: 250px;}
    #buttons span { 10px;height: 10px;border: 1px solid #fff;border-radius: 50%;margin-right: 5px;float: left;background: #333; }
    #buttons .on { background: orangered;}
    .arrow { cursor: pointer;display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; 40px; height: 40px; position: absolute; z-index: 2; top: 180px; background-color: RGBA(0,0,0,.3); color: #fff;}
    .arrow:hover { background-color: RGBA(0,0,0,.7);}
    #container:hover .arrow { display: block;}
    #prev { left: 20px;}
    #next { right: 20px;}
    </style>
    </head>
    <body>
    <div id="container">
    <div id="list" style="left: -600px;">
    <img src="img/5.jpg" alt="1"/>
    <img src="img/1.jpg" alt="1"/>
    <img src="img/2.jpg" alt="2"/>
    <img src="img/3.jpg" alt="3"/>
    <img src="img/4.jpg" alt="4"/>
    <img src="img/5.jpg" alt="5"/>
    <img src="img/1.jpg" alt="5"/>
    </div>
    <div id="buttons">
    <span index="1" class="on"></span>
    <span index="2"></span>
    <span index="3"></span>
    <span index="4"></span>
    <span index="5"></span>
    </div>
    <a href="javascript:;" id="prev" class="arrow">&lt;</a>
    <a href="javascript:;" id="next" class="arrow">&gt;</a>
    </div>
    <script type="text/javascript">
    window.onload = function(){
    var getById = function(id){
    return document.getElementById(id);
    }
    var container = getById("container");
    var list = getById("list");
    var btns = getById("buttons").getElementsByTagName("span");
    var prev = getById("prev");
    var next = getById("next");
    var index = 1;
    var animated = false;
    var timer;

    function showBtn() {
    //去掉多余的类
    for(var i=0;i<btns.length;i++) {
    if(btns[i].className == "on"){
    btns[i].className = "";
    }
    }
    btns[index - 1].className = "on";
    }
    //改变list的显示
    function animate(offset){
    animated = true;
    var newLeft = parseInt(list.style.left) + offset;
    var time = 300; //位移总时间
    var interval = 10; //位移间隔时间
    var speed = offset/(time/interval); //每次的位移量

    function go(){
    if((speed<0 && parseInt(list.style.left) > newLeft) || (speed>0 &&parseInt(list.style.left) < newLeft)){
    list.style.left = parseInt(list.style.left) + speed + "px";
    setTimeout(go,interval); //函数的递归
    }else{
    animated = false;
    list.style.left = newLeft + "px";
    if(newLeft > -600) {
    list.style.left = -3000 + "px";
    }
    if(newLeft < -3000){
    list.style.left = -600 + "px";
    }
    }
    }
    go();

    }
    //自动切换
    function aotuPlay(){
    timer = setInterval(function(){
    next.onclick();
    }, 3000)
    }

    function stop(){
    clearInterval(timer);
    }

    //左右按钮添加事件
    next.onclick = function(){
    if(index == 5){
    index = 1;
    }else{
    index += 1;
    }
    showBtn();
    if(!animated){
    animate(-600);
    }
    }
    prev.onclick = function(){
    if(index == 1){
    index = 5;
    }else{
    index -= 1;
    }
    showBtn();
    if(!animated){
    animate(600);
    }
    }
    //圆点添加事件
    for(var i=0;i<btns.length;i++){
    btns[i].onclick = function(){
    if(this.className == "on"){
    return;
    }
    var myIndex = parseInt(this.getAttribute("index"));
    var offset = -600 * (myIndex - index);
    if(!animated){
    animate(offset);
    }
    index = myIndex;
    showBtn();
    }
    }

    //添加自动播放
    container.onmouseover = stop;
    container.onmouseout = aotuPlay;

    aotuPlay();
    }
    </script>
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/liushuang001/p/5386736.html
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