这是偶实现的方法
<!DOCTYPE html><html lang="zh-cn"><head><meta charset="UTF-8"><title>多图切换最简单</title><link rel="stylesheet" href="base.css" /><style>.banner{ width: 200px; height: 120px; margin: 80px auto 0 auto;}</style><script type="text/javascript" src="jquery-1.10.1.min.js" ></script></head><body><p class="banner"><img src="img/aaa.png" id="slide" width="200" height="120"></p><script>$(function() {simpleSlide();});function simpleSlide(){var index = 0;var arr = ['aaa.png', 'bbb.png', 'ccc.png'];setInterval(function(){index == (arr.length - 1) ? index = 0 : index ++;$("#slide")[0].src = 'img/' + arr[index];}, 4000);}</script></body></html>
结果，群友(大树)实现了更简单的方法
function simpleSlide(){var index = 0;var arr = ['aaa.png', 'bbb.png', 'ccc.png'];setInterval(function(){index++;$("#slide")[0].src = 'img/' + arr[index%arr.length];}, 4000);}
效果图：
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