<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>图片切换设置</title> <style> p { margin:0; } body { text-align:center; } #box { width:400px; height:400px; border:10px solid #ccc; margin:50px auto 0; position:relative; } a { width: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; } a:hover { filter:alpha(opacity:30); opacity:0.3; } #prev { left:10px; } #next { right:10px; } #p1 { width: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; } strong { width: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; } #img1 { width:400px; height:400px; } span { position:absolute; width:400px; height:30px; line-height:30px; text-align:center; top:-50px; left:0; font-family:'微软雅黑'; } </style> </head> <script type="text/javascript"> window.onload = function(){ var oPrev = document.getElementById('prev') var oNext = document.getElementById('next') var oP1 = document.getElementById('p1') var oStrong1 = document.getElementById('strong1') var oImg1 = document.getElementById('img1') var aBtn = document.getElementsByTagName('input') var num = 0; var onOff = true; var arrUrl = ['img/1.png','img/2.png','img/3.png','img/4.png',] var arrText = ['图片一','图片2','图片3','图片4',] aBtn[0].onclick = function(){ onOff = true; document.getElementsByTagName('span')[0].innerHTML = '图片可以从最后一张跳到第一张循环切换';}; 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';}; // 初始化 function fnTnb(){ oStrong1.innerHTML = num + 1 +'/'+ arrUrl.length; oP1.innerHTML = arrText[num]; oImg1.src = arrUrl[num]; } fnTnb(); // 左箭头 oPrev.onclick =function () { num --; if (num == -1) {if (onOff) {num = arrText.length -1;} else { alert('这是第一张了，不能往前了---') num = 0; } } fnTnb(); }; oNext.onclick =function () { num ++; if (num == arrText.length) {if (onOff) {num = 0;} else { alert('这是第一张了，不能往前了---') num = arrText.length - 1; } } fnTnb(); }; } </script> <body> <input type="button" value="循环切换" /> <input type="button" value="顺序切换" /> <div id="box"><span>图片可从最后一张跳转到第一张循环切换</span> <a id="prev" href="javascript:;"><</a> <a id="next" href="javascript:;">></a> <p id="p1">图片文字加载中……</p> <strong id="strong1">图片数量计算中……</strong> <img id="img1" /> </div> </body> </html>