1 <!DOCTYPE HTML> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 5 <title>无标题文档</title> 6 <style> 7 p { margin:0; } 8 body { text-align:center; } 9 #box { 400px; height:400px; border:10px solid #ccc; margin:50px auto 0; position:relative; } 10 a { 40px; height:40px; background:#fff; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:160px; font-size:18px; color:#000; text-align:center; line-height:40px; text-decoration:none; } 11 a:hover { filter:alpha(opacity:30); opacity:0.3; } 12 #prev { left:10px; } 13 #next { right:10px; } 14 #p1 { 400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; bottom:0; left:0; } 15 strong { 400px; height:30px; line-height:30px; text-align:center; background:#000; color:#fff; font-size:14px; filter:alpha(opacity:80); opacity:0.8; position:absolute; top:0; left:0; } 16 #img1 { 400px; height:400px; } 17 span { position:absolute; 400px; height:30px; line-height:30px; text-align:center; top:-50px; left:0; font-family:'微软雅黑'; } 18 </style> 19 <script> 20 window.onload = function (){ 21 var oPrev = document.getElementById('prev'); 22 var oNext = document.getElementById('next'); 23 var oP = document.getElementById('p1'); 24 var oStrong = document.getElementById('strong1'); 25 var oImg = document.getElementById('img1'); 26 var aBtn = document.getElementsByTagName('input'); 27 28 var arrUrl = [ 'img/1.jpg', 'img/2.jpg', 'img/3.jpg', 'img/4.jpg' ]; 29 var arrText = [ '文字一', '文字二', '文字三', '识文断字' ]; 30 var num = 0; 31 var onOff = true; 32 33 aBtn[0].onclick = function (){ onOff = true; document.getElementsByTagName('span')[0].innerHTML = '图片可从最后一张跳转到第一张循环切换'; }; 34 aBtn[1].onclick = function (){ onOff = false; document.getElementsByTagName('span')[0].innerHTML = '图片只能到最后一张或只能到第一张切换'; }; 35 36 // 初始化 37 function fnTab(){ 38 oP.innerHTML = arrText[num]; 39 oStrong.innerHTML = num+1 + ' / ' + arrText.length; 40 oImg.src = arrUrl[num]; 41 } 42 fnTab(); 43 44 oPrev.onclick = function (){ 45 num --; 46 if( num == -1 ){ 47 if(onOff){num = arrText.length-1;}else{ 48 alert('这已经是第一张了，不能再往前了~~'); 49 num = 0; 50 } 51 //num = arrText.length-1; 52 } 53 fnTab(); 54 }; 55 oNext.onclick = function (){ 56 num ++; 57 if( num == arrText.length ){ 58 if(onOff){num = 0;}else{ 59 alert('已经到最后一张啦~'); 60 num = arrText.length-1; 61 } 62 } 63 fnTab(); 64 }; 65 66 }; 67 </script> 68 </head> 69 70 <body> 71 72 <input type="button" value="循环切换" /> 73 <input type="button" value="顺序切换" /> 74 75 76 <div id="box"><span>图片可从最后一张跳转到第一张循环切换</span> 77 <a id="prev" href="javascript:;"><</a> 78 <a id="next" href="javascript:;">></a> 79 <p id="p1">图片文字加载中……</p> 80 <strong id="strong1">图片数量计算中……</strong> 81 <img id="img1" /> 82 </div> 83 84 </body> 85 </html>