定时轮播图片
效果图（图片一直轮流切换）：
代码：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>轮播图测试</title> <script> window.onload = function(){ window.setInterval(changePic,1000); } var num = 1; function changePic(){ ++num; if(num == 4){ num = 1; } var imgElement = document.getElementById("img1"); imgElement.src = "img/"+num+".jpg"; } </script> </head> <body> <img id="img1" src="img/1.jpg" width="100%" /> </body> </html>
