js原生图片轮播

来源：互联网发布：银行家算法 0 4 2 0 编辑：程序博客网时间：2024/06/02 11:49
<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title>图片轮播</title>    <style type="text/css">        *{ margin: 0 auto; text-decoration: none;}        body { padding: 20px;}        #container { width: 600px; height: 400px; border: 3px solid #333; overflow: hidden; position: relative;}        #list { width: 4200px; height: 400px; position: absolute; z-index: 1;}        #list img { float: left;width: 600px;height: 400px}        #buttons { position: absolute; height: 10px; width: 100px; z-index: 2; bottom: 20px; left: 250px;}        #buttons span { cursor: pointer; float: left; border: 1px solid #fff; width: 10px; height: 10px; border-radius: 50%; background: #333; margin-right: 5px;}        #buttons .on {  background: orangered;}        .arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 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="imgs/1189056.jpg" alt="1"/>        <img src="imgs/756096.jpg" alt="1"/>        <img src="imgs/1113146.jpg" alt="2"/>        <img src="imgs/1159701.jpg" alt="3"/>        <img src="imgs/1159703.jpg" alt="4"/>        <img src="imgs/1189056.jpg" alt="5"/>        <img src="imgs/756096.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"><</a>    <a href="javascript:;" id="next" class="arrow">></a></div><script>    var container=document.getElementById("container");    var list=document.getElementById("list");    var buttons = document.getElementById('buttons').getElementsByTagName('span');    var prev = document.getElementById('prev');    var next = document.getElementById('next');    var index = 1;    var len = 5;//图片个数    var animated = false;    var interval = 3000;//间隔3秒    var timer;//自动播放    window.onload=function(){        function animate (offset) {            if (offset == 0) {                return;            }            animated = true;            var time = 300;            var inteval = 10;            var speed = offset/(time/inteval);            var left = parseInt(list.style.left) + offset;            //点击切换            var go = function (){                if ( (speed > 0 && parseInt(list.style.left) < left) || (speed < 0 && parseInt(list.style.left) > left)) {                    list.style.left = parseInt(list.style.left) + speed + 'px';                    setTimeout(go, inteval);                }                else {                    list.style.left = left + 'px';                    if(left>-200){                        list.style.left = -600 * len + 'px';                    }                    if(left<(-600 * len)) {                        list.style.left = '-600px';                    }                    animated = false;                }            }            go();        }        //点击圆圈切换        function showButton() {            for (var i = 0; i < buttons.length ; i++) {                if( buttons[i].className == 'on'){                    buttons[i].className = '';                    break;                }            }            buttons[index - 1].className = 'on';        }        //自动播放        function play() {            timer = setTimeout(function () {                next.onclick();                play();            }, interval);        }        function stop() {            clearTimeout(timer);        }        //点击右键头        next.onclick = function () {            if (animated) {                return;            }            if (index == 5) {                index = 1;            }            else {                index += 1;            }            animate(-600);            showButton();        }        //点击左箭头        prev.onclick = function () {            if (animated) {                return;            }            if (index == 1) {                index = 5;            }            else {                index -= 1;            }            animate(600);            showButton();        }        for (var i = 0; i < buttons.length; i++) {            buttons[i].onclick = function () {                if (animated) {                    return;                }                if(this.className == 'on') {                    return;                }                var myIndex = parseInt(this.getAttribute('index'));                var offset = -600 * (myIndex - index);                animate(offset);                index = myIndex;                showButton();            }        }        //鼠标移入移出        container.onmouseover = stop;        container.onmouseout = play;        play();    }</script></body></html>
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