妙味课堂作业之图片切换

来源：互联网发布：windows 3.2程序编辑：程序博客网时间：2024/04/29 13:42

<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</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> <script> window.onload = function (){ var oPrev = document.getElementById('prev'); var oNext = document.getElementById('next'); var oP = document.getElementById('p1'); var oStrong = document.getElementById('strong1'); var oImg = document.getElementById('img1'); var aBtn = document.getElementsByTagName('input'); var arrUrl = [ 'img/1.jpg', 'img/2.jpg', 'img/3.jpg', 'img/4.jpg' ]; var arrText = [ '文字一', '文字二', '文字三', '识文断字' ]; var num = 0; var onOff = true; 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'; }; 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'; }; // 初始化 function fnTab(){ oP.innerHTML = arrText[num]; oStrong.innerHTML = num+1 + ' / ' + arrText.length; oImg.src = arrUrl[num]; } fnTab(); oPrev.onclick = function (){ num --; if( num == -1 ){ if(onOff){num = arrText.length-1;}else{ alert('这已经是第一张了，不能再往前了~~'); num = 0; } //num = arrText.length-1; } fnTab(); }; oNext.onclick = function (){ num ++; if( num == arrText.length ){ if(onOff){num = 0;}else{ alert('已经到最后一张啦~'); num = arrText.length-1; } } fnTab(); }; }; </script> </head> <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>

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