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老师批语：看出得非常的用心, 通过这个案例,基本上把jQ常用语法都用到了
<!DOCTYPE html>
<html>
<head>
<title>jquery改写图片轮播</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<style>
#lunbo{width: 600px;height: 300px;margin: 0 auto;overflow: hidden;}
#pics{width: 600px;height: 300px;cursor: pointer;position: relative;}
ul li{width: 600px;height: 300px;list-style: none;position: absolute;top: 0;left: 0;display: none;}
img{width: 600px;height: 300px;}
</style>
</head>
<body>
<div id="lunbo">
<ul id="pics">
<li style="display: inline;"><img src="https://img1.360buyimg.com/da/s590x470_jfs/t1/79425/15/4421/98558/5d283017E29d9a8fb/723bfa83c3f73613.jpg!q90!cc_590x470.webp"></li>
<li><img src="https://img1.360buyimg.com/pop/s590x470_jfs/t1/45206/26/5099/84405/5d2c41f8E490ac899/c03df426cd52bfe9.jpg!q90!cc_590x470.webp"></li>
<li><img src="https://imgcps.jd.com/ling/7307139/6LaF5biC54m56Imy57K-6YCJ/54iG5ZOB5L2O6IezOS455YWD/t-5bd95d4f8e34e21f3ff67e71/15a71c63.jpg"></li>
</ul>
</div>
<script type="text/javascript">
$(document).ready(function(){
var oLi = $("li");
var liWidth = oLi.eq(0).width();
var liHeight = oLi.eq(0).height();
//每隔3秒进行轮播
var timer = setInterval(change,3000);
//鼠标放置在图片上时停止轮播，移开时继续轮播
$("div").mouseover ( function(){
clearInterval(timer);
})
$("div").mouseout (function(){
timer = setInterval(change,3000);
})
//轮播函数
var prevIndex = 0,nextIndex = 1;
function change(){
if (prevIndex == oLi.length-1 ) {//若当前图片是最后一张图片，下一张出现首张图片
nextIndex = 0;
}
var n = Math.floor(Math.random()*3);
if (n == 0) {
fade(prevIndex,nextIndex);
}
else if (n== 2) {
slide(prevIndex,nextIndex);
}
else{
grap(prevIndex,nextIndex);
}
prevIndex = nextIndex;
nextIndex ++;
}
//淡入淡出效果,
function fade(prevIndex,nextIndex){
//传入当前显示图片以及下一张图片的索引
oLi.eq(prevIndex).fadeOut(1000);
oLi.eq(nextIndex).fadeIn(1000);
}
//向左右滑动效果
function slide(prevIndex,nextIndex){
var rand = Math.floor(Math.random()*2);
oLi.eq(nextIndex).show();
oLi.eq(nextIndex).css("z-index","-1");
if (rand) {
//向左滑动
oLi.eq(prevIndex).animate({left: -liWidth},1000,fun);
}
else{
oLi.eq(prevIndex).animate({left: liWidth},1000,fun);
}
function fun(){
oLi.eq(prevIndex).css({"left":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
}
}
//收缩效果
function grap(prevIndex,nextIndex){
var rand = Math.floor(Math.random()*4);
oLi.eq(nextIndex).show();
oLi.eq(nextIndex).css("z-index","-1");
switch (rand){
case 0://向左上角滑动
oLi.eq(prevIndex).animate({left: -liWidth,top: -liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":"0","top": "0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 1://向右上角滑动
oLi.eq(prevIndex).animate({left: liWidth,top: -liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 2://向右下角滑动
oLi.eq(prevIndex).animate({left: liWidth,top: liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
case 3://向左下角滑动
oLi.eq(prevIndex).animate({left: -liWidth,top: liHeight},1000,function(){
oLi.eq(prevIndex).css({"left":'0',"top":"0","display":"none"});
oLi.eq(nextIndex).css("z-index","1");
});break;
default:break;
}
}
});
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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