js 简单的滑动教程（二）
作者：Lellansin 转载请标明出处，谢谢
现在我们让滑动多一个功能，三张图、点击左边向左滑动，点右向右滑，碰到临界值的时候可以循环滑动
原理也很将简单，用position:absolute将定位设置成决定定位，通过改变图片相对于绝对位置的坐标来实现滑动。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>js简单的滑动教程（2）</title> <style type="text/css"> *{ margin:0; padding:0; } li{ list-style: none; } #window{ height:200px; width:230px; margin:0 auto; overflow:hidden; } #center_window{ height:200px; width:160px; float:left; } #center_window ul{ height:200px; width:160px; position:absolute;overflow:hidden } #center_window ul li{ height:200px; width:160px; float:left; position:absolute;} #center_window img{ display:block; margin:5px auto; } #left_arrow{ height:200px; width:35px; float:left; background:url("left.png") no-repeat scroll 5px 75px #fff; } #left_arrow:hover{ cursor: pointer; } #right_arrow{ height:200px; width: 35px; float:right; background:url("right.png") no-repeat scroll 0px 75px #fff; } #right_arrow:hover{ cursor: pointer; } </style> </head> <body> <div id="window"> <div id="left_arrow" onclick="sliderLeft()"></div> <div id="center_window"> <ul> <li id="list_0"><img src="img/1.jpg" /></li> <li id="list_1"><img src="img/2.jpg" /></li> <li id="list_2"><img src="img/3.jpg" /></li> </ul> </div> <div id="right_arrow" onclick="sliderRight()"></div> </div> <div id="text" style="margin:0 auto;width:200px;"> </div> <script> // 图片总数 var total = 3; //当所有图片都显示的时候，所有图片的left都=0，这个时候最后一张图会叠最上面，所以计数器从最后一个开始计数 var count = total-1;
function sliderLeft(){ // 拼出当前以及左右图片的id var left = "list_"+((count+total*100-1)%total); var center = "list_"+((count+total*100)%total); var right = "list_"+((count+total*100+1)%total); // 获取对象 var pic_left = document.getElementById(left); var pic_center = document.getElementById(center); var pic_right = document.getElementById(right); // 设置坐标 pic_left.style.left = -160 + "px"; pic_center.style.left = 0 + "px"; pic_right.style.left = 160 + "px"; var i=0; var timer = setInterval(function(){ if(i<=160){ //滑动 pic_left.style.left = i-160 + "px"; pic_center.style.left = i + "px"; pic_right.style.left = i+160 + "px"; i+=40; }else{ clearInterval(timer); } },80); // 计数 count--; } function sliderRight(){ // 拼出id var left = "list_"+((count+total*100-1)%total); var center = "list_"+((count+total*100)%total); var right = "list_"+((count+total*100+1)%total); // 获取对象 var pic_left = document.getElementById(left); var pic_center = document.getElementById(center); var pic_right = document.getElementById(right); //设置坐标 pic_left.style.left = -160 + "px"; pic_center.style.left = 0 + "px"; pic_right.style.left = 160 + "px"; var i=160; var timer = setInterval(function(){ if(i>=0){ // 滑动 pic_left.style.left = i - 320 + "px"; pic_center.style.left = i - 160 + "px"; pic_right.style.left = i + "px"; i-=40; }else{ clearInterval(timer); } },80); // 计数 count++; } </script> </body> </html>
效果演示（IE6+）：
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