js图片轮播手动切换特效

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>无标题文档</title> <style> * {padding:0px;margin:0px;} #content {width:400px;height:400px;border:10px solid #ccc;position:absolute;top:50%;left:50%;margin-top:-200px;margin-left:-200px;} #top,#bottom {width:400px;height:40px;background:#000;color:#fff;filter(opacity:80);opacity:0.8;text-align:center;line-height:40px;position:absolute;} #top {top:0;} #bottom {bottom:0;} #prev,#next {position:absolute;top:50%;margin-top:-20px;width:40px;height:40px;text-align:center;line-height:40px;text-decoration:none;background:#000;color:#fff;font-size:30px;font-weight:bold;} #prev {left:10px;} #next {right:10px;} #img1 {width:400px;height:400px;} #tab {position:absolute;width:400px;height:100px;margin-top:-90px;text-align:center;} #info {margin-top:10px;font-size:20px;} #tab input {width:70px;height:30px;} .active { background : yellow;} </style> </head> <body> <div id="content"> <div id="tab"> <input id="loopBtn" type="button" value="循环切换" /> <input id="orderBtn" type="button" value="顺序切换" /> <p id="info">图片顺序加载中......</p> </div> <p id="top">图片数量加载中......</p> <a id="prev" href="javascript:;"><</a> <a id="next" href="javascript:;">></a> <p id="bottom">图片信息加载中.....</p> <img id="img1" /> </div> <script> window.onload = function () { var top = $('top'), bottom = $('bottom'), prev = $('prev'), next = $('next'), img = $('img1'), loopBtn = $('loopBtn'), orderBtn = $('orderBtn'), info = $('info'), tab = $('tab'); // 切换图片顺序的按钮 var btns = tab.getElementsByTagName('input'); // 第几张图片 var num = 0; // 图片url var picSrc = ['img/1.jpg', 'img/2.jpg', 'img/3.jpg', 'img/4.jpg']; // 图片的数量 var picLen = picSrc.length; // 图片信息 var picInfo = ['高冷美女','终结者','性感美女','妖娆美女']; // 循环方式 var loopMethod = 1; // 1,循环切换；0，,顺序切换 // 循环信息 var loopInfo = ['图片可以从最后一张转到第一种切换','图片只能切换到最后一张或者第一张']; changePic(); // 循环切换 loopBtn.onclick = function () { loopMethod = 1; changeOrder(); } // 顺序切换 orderBtn.onclick = function () { loopMethod = 0; changeOrder(); } // 上一张 prev.onclick = function () { num--; // 1,循环切换；0，,顺序切换 if(loopMethod) { if (num === -1) num = picLen - 1; changePic(); } else { if (num === -1) { num = 0; alert('已经是第一张图片啦!'); } changePic(); } } // 下一张 next.onclick = function () { num++; // 1,循环切换；0，,顺序切换 if(loopMethod) { if (num === picLen) num = 0; changePic(); } else { if (num === picLen) { num = picLen - 1; alert('已经是最后一张图片啦!'); } changePic(); } } // 切换顺序 function changeOrder () { // 情况按钮的高亮 for ( var i = 0, len = btns.length; i < len;i++) { btns[i].className = ''; } // 循环切换 1，循环；0，顺序 info.innerHTML = loopInfo[1 - loopMethod]; loopMethod === 1 ? loopBtn.className = 'active' : orderBtn.className = 'active'; } // 切换图片 function changePic () { changeOrder(); top.innerHTML = num + 1 + ' / ' + picLen; bottom.innerHTML = picInfo[num]; img.src = picSrc[num]; } // id选择器 function $(id) { return document.getElementById(id);} } </script> </body> </html>

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