Der Inhalt dieses Artikels befasst sich mit dem Codebeispiel (detaillierter Code) zur Implementierung eines Bildkarussells in js. Ich hoffe, dass es für Sie hilfreich ist.
broadcast.js
var CarouselFigure = new Object();
//轮播图初始化定义函数
CarouselFigure.init = function(tmpobj){
//定义动画帧数(默认为：30)
this.frameNum = tmpobj.frameNum !=undefined ? tmpobj.frameNum : 30;
//定义一次轮播的时间(默认为：0.2s)
this.comsumeTime = tmpobj.comsumeTime !=undefined ? tmpobj.comsumeTime : 200;
//定义轮播图的宽高(默认宽高为：700px * 250px)
this.CFWidth = tmpobj.CFWidth !=undefined ? tmpobj.CFWidth : 700;
this.CFHeight = tmpobj.CFHeight !=undefined ? tmpobj.CFHeight : 250;
//定义轮播的风格
this.type = tmpobj.type == "small" ? 'small' : 'big';
//轮播图的按钮大小的宽高
this.AssowWidth = tmpobj.AssowWidth !=undefined ? tmpobj.AssowWidth : 76;
this.AssowHeight = tmpobj.AssowHeight !=undefined ? tmpobj.AssowHeight : 112;
//判断用户是否初始化
this.initFlag = true;
//是否允许轮播图运行
this.applicationflag = true;
}
CarouselFigure.start = function(){
/**
第一部分类容：初始化整个轮播图和其运行数据
*/
(function(){
//1. 判断用户是否进行初始化
if(CarouselFigure.initFlag == undefined){
CarouselFigure.init({});
}
//2.1 初始化整个轮播图的div的基本大小
$("#CarouselFigure").width(CarouselFigure.CFWidth).height(CarouselFigure.CFHeight).css("position","relative");
//2.2 最中央的大图实际大小为:
CarouselFigure.ImgWidth = CarouselFigure.CFWidth * 2/3;
CarouselFigure.ImgHeight = CarouselFigure.CFHeight - 6;
//3. 初始化轮播图按钮数据
CarouselFigure.setAssowdata = {
prev:{
top:(CarouselFigure.CFHeight - CarouselFigure.AssowHeight)/2 +"px",
left:CarouselFigure.CFWidth/6 - CarouselFigure.AssowWidth + 6 + "px",
originUrl:$("#CarouselFigure > img:eq(0)").attr("src"),
hoverUrl:$("#CarouselFigure > img:eq(1)").attr("src"),
},
next:{
top:(CarouselFigure.CFHeight - CarouselFigure.AssowHeight)/2 +"px",
left:CarouselFigure.CFWidth*5/6 + "px",
originUrl:$("#CarouselFigure > img:eq(2)").attr("src"),
hoverUrl:$("#CarouselFigure > img:eq(3)").attr("src"),
}
};
//4.1 初始化轮播图的url和src信息，存放到一个容器中
CarouselFigure.imageContains = [];
$("#CarouselFigure ul li img").each(function(){
var tmpobj = {src:$(this).attr("src"),href:$(this).attr("href")}
CarouselFigure.imageContains.push(tmpobj);
});
//4.2 对轮播图容器数据进行处理,当轮播图的个数3<= x <= 5 只能使用small风格类型。当轮播图的个数 x < 3 时， 停止运行
if(CarouselFigure.imageContains.length < 3){
CarouselFigure.applicationflag = false;
}else if(CarouselFigure.imageContains.length < 6){
CarouselFigure.type = 'small';
}
//4.3 对轮播容器数据按顺序进行增倍，保证有足够数据进行轮播
var objstr = JSON.stringify(CarouselFigure.imageContains);
CarouselFigure.imageContains = CarouselFigure.imageContains.concat(JSON.parse(objstr));
//5.1 轮播图使用big风格时，页面七张图在静态页面中的属性值
CarouselFigure.setViewPosData = new Object;
CarouselFigure.setViewPosData.big = [
{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:0, top:0,
zIndex:1, opacity:0.2, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:0, top:CarouselFigure.CFHeight*5/16,
zIndex:2, opacity:0.7, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/4, height:CarouselFigure.ImgHeight*3/4,
left:CarouselFigure.CFWidth/18, top:CarouselFigure.CFHeight/8,
zIndex:3, opacity:0.9, borderSize:0
},{
width:CarouselFigure.ImgWidth, height:CarouselFigure.ImgHeight,
left:CarouselFigure.CFWidth/6, top:0,
zIndex:4, opacity:1, borderSize:3
},{
width:CarouselFigure.ImgWidth*3/4, height:CarouselFigure.ImgHeight*3/4,
left:CarouselFigure.CFWidth * 4/9, top:CarouselFigure.CFHeight/8,
zIndex:3, opacity:0.9, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:CarouselFigure.CFWidth * 3/4, top:CarouselFigure.CFHeight*5/16,
zIndex:2, opacity:0.7, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:CarouselFigure.CFWidth * 3/4, top:0,
zIndex:1, opacity:0.2, borderSize:0
},];
//5.2 轮播图使用small风格时，页面5张图在静态页面中的属性值
CarouselFigure.setViewPosData.small = [
{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:0, top:0,
zIndex:1, opacity:0.2, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/4, height:CarouselFigure.ImgHeight*3/4,
left:0, top:CarouselFigure.CFHeight/8,
zIndex:2, opacity:0.9, borderSize:0
},{
width:CarouselFigure.ImgWidth, height:CarouselFigure.ImgHeight,
left:CarouselFigure.CFWidth/6, top:0,
zIndex:3, opacity:1, borderSize:3
},{
width:CarouselFigure.ImgWidth*3/4, height:CarouselFigure.ImgHeight*3/4,
left:CarouselFigure.CFWidth * 1/2, top:CarouselFigure.CFHeight/8,
zIndex:2, opacity:0.9, borderSize:0
},{
width:CarouselFigure.ImgWidth*3/8, height:CarouselFigure.ImgHeight*3/8,
left:CarouselFigure.CFWidth * 3/4, top:0,
zIndex:1, opacity:0.2, borderSize:0
}];
}());
//验证初始化是否成功,否则全部隐藏,结束进程
if(!CarouselFigure.applicationflag){
$("#CarouselFigure").css("display","none");
return false;
}
/**
第二部分：
对轮播图的箭头进行初始化(包括页面中的静态布局，和点击事件和悬浮事件)
*/
CarouselFigure.InitAssow = function (Assow,direction){
//实现轮播图箭头的静态样式、悬浮事件和点击事件
Assow.css({
position:"absolute",
left:this.setAssowdata[direction].left,
top:this.setAssowdata[direction].top,
"z-index":4
})
.mouseover(function(){ //鼠标悬浮切换图片
$(this).attr("src",CarouselFigure.setAssowdata[direction].hoverUrl);
}).mouseout(function(){
$(this).attr("src",CarouselFigure.setAssowdata[direction].originUrl);
}).click(function(){
//记录点击事件的次数
CarouselFigure.clickArrowfun(direction);
});
}
//调用初始化轮播图函数--实现左右箭头全部功能
$("#CarouselFigure > img:odd").css("display","none");
CarouselFigure.InitAssow($("#CarouselFigure > img:eq(0)"),"prev");
CarouselFigure.InitAssow($("#CarouselFigure > img:eq(2)"),"next");
/**
第三部分：
对所有的轮播图进行页面静态布局
*/
//初始化某张轮播图的方法
CarouselFigure.InitImages = function (i,setViewPosData,imageContains){
$("#CarouselFigure ul img:eq("+i+")").css({
position:"absolute",
width:setViewPosData[i].width + "px",
height:setViewPosData[i].height + "px",
top:setViewPosData[i].top + "px",
left:setViewPosData[i].left + "px",
display:"block",
"z-index":setViewPosData[i].zIndex,
opacity:setViewPosData[i].opacity,
}).attr({
src:imageContains[i].src,
href:imageContains[i].href
}).click(function(){
location.href = $(this).attr("href"); //绑定图片点击跳转事件
});
if( (i == 0 || i == 6) && this.type == 'big'){ //第1张图片和第7张图片不可见
$("#CarouselFigure ul img:eq("+i+")").css("display","none");
}else if(i == 3 && this.type == 'big'){ //为正中央图片加边框
$("#CarouselFigure ul img:eq("+i+")").css("border","3px solid #fff");
}else if( (i == 0 || i == 4)&&this.type == 'small'){//第1张图片和第5张图片不可见
$("#CarouselFigure ul img:eq("+i+")").css("display","none");
}else if(i == 2 && this.type == 'small'){ //为正中央图片加边框
$("#CarouselFigure ul img:eq("+i+")").css("border","3px solid #fff");
}
}
/**
实现七张图片的静态样式：
清空原有的li标签，然后新建<li><img></li>来存放每张轮播图。
*/
$("#CarouselFigure ul").empty();
for(var i = 0; i < CarouselFigure.setViewPosData[CarouselFigure.type].length; i++){
$("#CarouselFigure ul").append('<li><img src=""></li>');
CarouselFigure.InitImages(i,CarouselFigure.setViewPosData[CarouselFigure.type],CarouselFigure.imageContains);
}
/**
第四部分：
形成轮播动画效果
*/
/*
设置clickArrow变量：作为动画的标示位，让其进行队列化，必须本次动画完成，才能进行下次动画轮播。
1. 当为负数时向前轮播，比如：-5向前轮播五次动画；
2. 当为正数时向后轮播，同理；
3. 当等于0时，此时没有进行轮播。
*/
CarouselFigure.clickArrow = 0 ;
// 处理动画队列方法：
CarouselFigure.clickArrowfun = function (direction){
if(this.clickArrow == 0){
this.startAnimation(direction);
}
if(direction == "prev"){
this.clickArrow--;
}else if(direction == "next"){
this.clickArrow++;
}
}
/**
开始一次轮播动画
其中composerAnimateNum变量为：
在一次动画中，记录每张轮播图完成的标识符；
在big风格类型中：当其值为6时说明此次动画全部完成
在small风格类型中：当其值为4时说明此次动画全部完成
*/
CarouselFigure.startAnimation = function(direction){
this.completeAnimationNum = 0;
if(direction == "prev"){ //从最后一张图片到第一张轮播图片，分别向前移动，首先让最后一张图片可视
if(this.type == "big"){
$("#CarouselFigure ul img:eq(6)").css("display","block");
}else{
$("#CarouselFigure ul img:eq(4)").css("display","block");
}
for(var i = this.setViewPosData[this.type].length - 1 ; i > 0; i --){
this.startMove(i, this.setViewPosData[this.type][i],this.setViewPosData[this.type][i-1],direction);
}
}else if(direction == "next"){//从第一张图片到倒数第二张图片，分别向后移动，首先让第一张轮播图片可视
$("#CarouselFigure ul img:eq(0)").css("display","block");
for(var i = 0 ; i < this.setViewPosData[this.type].length - 1; i ++){
this.startMove(i, this.setViewPosData[this.type][i],this.setViewPosData[this.type][i+1],direction);
}
}
}
/**
功能:让一张轮播图从某一个状态变换到另一个状态
(包括位子、透明度、边框等等属性)
*/
CarouselFigure.startMove = function (index,startObj,endObj,direction){
//所有属性的增量
var increaseLeft = endObj.left - startObj.left;
var increaseTop = endObj.top - startObj.top;
var increaseWidth = endObj.width - startObj.width;
var increaseHeight = endObj.height - startObj.height;
var increaseOpacity = endObj.opacity - startObj.opacity;
var increaseBorderSize = endObj.borderSize - startObj.borderSize;
var time = this.frameNum; //共总帧数
var i = 1; //帧数的记步标志索引
//定义函数：一帧到下一帧的变化过程
function moveStep(){
setTimeout(function(){
var tmpObj = $("#CarouselFigure ul img:eq("+index+")");
//每一帧时图片的属性改变量
tmpObj.css({
width:startObj.width + (increaseWidth/time) * i + "px",
height:startObj.height + (increaseHeight/time) * i + "px",
top:startObj.top + (increaseTop/time) * i + "px",
left:startObj.left + (increaseLeft/time) * i + "px",
border:startObj.borderSize + (increaseBorderSize/time) * i + "px solid #fff",
opacity:startObj.opacity + (increaseOpacity/time) * i,
});
//当小于30帧时，继续递归，直至调用30次完成动画效果
if( i++ <time){
if(i == 15){//轮播图每张图片的层级关系处理方式
var zIndex = new Object;
zIndex.big = {prev:[null,1,2,3,4,3,2],next:[2,3,4,3,2,1]};
zIndex.small = {prev:[null,1,2,3,2,1],next:[2,3,2,1]}
tmpObj.css("z-index",zIndex[CarouselFigure.type][direction][index]);
}
moveStep(); //递归
}else{
CarouselFigure.completeAnimation(direction); //完成一张图片的动画
}
},CarouselFigure.comsumeTime/time);
}
moveStep(); //开始动画
}
/**
第五部分：
当每次轮播动画结束后的处理函数
1. 首先，判断一次轮播动画是否结束；
2. 对容器数据(imageContains)进行调整，形成队列
3. 重新渲染整个轮播图的静态页面
4. 通过clickArrow，处理动画队列
*/
CarouselFigure.completeAnimation = function(direction){
this.completeAnimationNum++;
//表示完成一次动画
if(this.completeAnimationNum == (this.setViewPosData[this.type].length -1)){
//重构用户自定义数据的顺序；
if(direction == "prev"){
var tmp = this.imageContains.shift();
this.imageContains.push(tmp);
}else if(direction == "next"){
var tmp = this.imageContains.pop();
this.imageContains.unshift(tmp);
}
//重新渲染轮播图七张图片的静态样式
for(var i = 0; i < this.setViewPosData[this.type].length; i++){
this.InitImages(i,this.setViewPosData[this.type],this.imageContains);
}
//解决边框的bug的问题
if(this.type == 'big'){
$("#CarouselFigure ul li img:even").css("border","0px");
}else{
$("#CarouselFigure ul li img:odd").css("border","0px");
}
//处理动画队列
if(direction == "prev"){
this.clickArrow++;
}else if(direction == "next"){
this.clickArrow--;
}
if(this.clickArrow > 0){
this.startAnimation(direction);
}else if(this.clickArrow < 0){
this.startAnimation(direction);
}
}
}
};broadcast.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>轮播图实例</title>
<script src="js/jquery-3.3.1.min.js"></script>
</head>
<style>
*{
padding:0px;
margin:0px;
}
ul{
list-style:none;
}
body{
background:#eee;
padding:10px;
}
#CarouselFigure{
}
</style>
<body>
<div id="CarouselFigure">
<img src="img/prev.png" width="76" height="112" />
<img src="img/prev.png" />
<img src="img/next.png" width="76" height="112" />
<img src="img/next.png" />
<ul>
<li><img src="img/1.jpg" width="500" height="250"></li>
<li><img src="img/2.jpg"></li>
<li><img src="img/3.jpg"></li>
<li><img src="img/4.jpg"></li>
<li><img src="img/5.jpg"></li>
<li><img src="img/6.jpg"></li>
<li><img src="img/7.jpg"></li>
<li><img src="img/8.jpg"></li>
</ul>
</div>
</body>
</html>
<script src="js/broadcast.js"></script>
<script>
$(function(){
//对轮播图进行初始化
CarouselFigure.init({type:'small',comsumeTime:1000});
CarouselFigure.start();
})
</script>Effekte erzielen
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