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使用JS实现轮播图的效果
其中的一些css样式代码就省略了,下面只把结构层html、行为层js的代码展示出来 ,看代码说事。
一、简单的轮播图
<div class="box" id="box"> <div class="inner"> <ul> <li><a href="#"><img src="images/01.jpg" alt=""/></a></li> <li><a href="#"><img src="images/02.jpg" alt=""/></a></li> <li><a href="#"><img src="images/03.jpg" alt=""/></a></li> <li><a href="#"><img src="images/04.jpg" alt=""/></a></li> <li><a href="#"><img src="images/05.jpg" alt=""/></a></li> </ul> <div class="square"> <span class="current">1</span> <span>2</span> <span>3</span> <span>4</span> <span>5</span> </div> </div> </div>
<script> //获得要操作的对象 var box = document.getElementById("box"); var inner = box.children[0]; var ul = inner.children[0]; var square = inner.children[1]; var spans = square.children; //所有的字级元素 var imgWidth = inner.offsetWidth; //循环遍历span标签 for(var i=0;i<spans.length;i++){ spans[i].index = i; spans[i].onmouseover = function(){ for(var j=0;j<spans.length;j++){ spans[j].className = ""; } this.className = "current"; var target = -imgWidth*this.index; sports(ul,target); } } //运动函数的封装 function sports(obj,target){ clearInterval(obj.timeId); //,每次点击时先清空计时器 obj.timeId = setInterval(function(){ var step =10; var leader = obj.offsetLeft; //先获得当前的距离左侧的位置 // step = leader<target?step:-step; if(Math.abs(leader-target) > Math.abs(step)){ leader = leader+step; obj.style.left = leader + "px"; }else{ clearInterval(obj.timeId); //清除计时器 obj.style.left = target+"px"; } },10); } </script>
二、左右焦点轮播图
<div id="box" class="all"> <div class="ad"> <ul id="imgs"> <li><img src="images/1.jpg" alt=""/></li> <li><img src="images/2.jpg" alt=""/></li> <li><img src="images/3.jpg" alt=""/></li> <li><img src="images/4.jpg" alt=""/></li> <li><img src="images/5.jpg" alt=""/></li> </ul> </div> <div id="arr"> <span id="left"><</span> <span id="right">></span> </div> </div>
<script> //获取要操作对象 var box = document.getElementById("box"); var ad = box.children[0]; var ul = document.getElementById("imgs"); var arr = document.getElementById("arr"); var arrLeft = document.getElementById("left"); var arrRight = document.getElementById("right"); var imgWidth = ad.offsetWidth; var lis = ul.children; //鼠标移入大盒子时显示按钮 box.onmouseover = function(){ arr.style.display ="block"; } box.onmouseout = function(){ arr.style.display = "none"; //鼠标离开大盒子时隐藏按钮 } //给左右按钮注册单击事件 var pic=0; //重新定义一个变量,来标识图片的个数或索引 arrRight.onclick = function(){ if(pic<lis.length-1){ pic++; } var target = -imgWidth*pic; sports(ul,target); } arrLeft.onclick =function(){ if(pic>0){ pic--; } var target = -imgWidth*pic; sports(ul,target); } //运动函数的封装 function sports(obj,target){ clearInterval(obj.timeId); //,每次点击时先清空计时器 obj.timeId = setInterval(function(){ var step =10; var leader = obj.offsetLeft; //先获得当前的距离左侧的位置 // step = leader<target?step:-step; if(Math.abs(leader-target) > Math.abs(step)){ leader = leader+step; obj.style.left = leader + "px"; }else{ clearInterval(obj.timeId); //清除计时器 obj.style.left = target+"px"; } },10); } </script>
三、无缝滚动原理轮播图
<div class="box" id="screen"> <ul> <li><img src="images/01.jpg" alt=""/></li> <li><img src="images/02.jpg" alt=""/></li> <li><img src="images/03.jpg" alt=""/></li> <li><img src="images/04.jpg" alt=""/></li> <li><img src="images/01.jpg" alt=""/></li> </ul> </div>
<script> //获得要操作的对象 var box = document.getElementById("screen"); var ul = box.children[0]; var lis = ul.children; var imgWidth = ul.offsetWidth; var timeId =null; // timeId = setInterval(function(){ // var leader = ul.offsetLeft; // var step = -10; // if(leader>-1200){ // leader = leader + step; // ul.style.left = leader + ‘px‘; // }else{ // ul.style.left = "0px"; // } // },60) timeId = setInterval(play,60); //鼠标移入大盒子时,清除计时器 box.onmouseover = function(){ clearInterval(timeId); } //鼠标离开大盒子时,重新开启计时器 box.onmouseout = function(){ // timeId = setInterval(function(){ // var leader = ul.offsetLeft; // var step = -10; // leader = leader + step; // ul.style.left = leader + ‘px‘; // },60) timeId = setInterval(play,60); } //封装函数 function play(){ var leader = ul.offsetLeft; var step = -10; if(leader>-1200){ leader= leader + step; ul.style.left = leader + ‘px‘; }else{ ul.style.left = "0px"; } } </script>
四、完整的轮播图
<div id="box" class="all" > <div class="ad"> <ul id="imgs"> <li><img src="images/1.jpg" width=‘500‘ height=‘200‘ alt=""/></li> <li><img src="images/2.jpg" width=‘500‘ height=‘200‘ alt=""/></li> <li><img src="images/3.jpg" width=‘500‘ height=‘200‘ alt=""/></li> <li><img src="images/4.jpg" width=‘500‘ height=‘200‘ alt=""/></li> <li><img src="images/5.jpg" width=‘500‘ height=‘200‘ alt=""/></li> </ul> <ol></ol> </div> <div id="arr"> <span id="left"><</span> <span id="right">></span> </div> </div>
/** * Created by Administrator on 2016/8/25. */ /** * 封装了一个匀速运动函数 * @param obj * @param target */ function animate(obj,target){ clearInterval(obj.timerId); obj.timerId = setInterval(function(){ var leader = obj.offsetLeft; var step = 10; step = leader<target?step:-step; if(Math.abs(leader-target) > Math.abs(step)){ leader = leader + step; obj.style.left = leader + ‘px‘; }else{ clearInterval(obj.timerId); obj.style.left = target + ‘px‘; } },15) } /** * 封装了一个滚动函数 */ function play(){ var leader = ul.offsetLeft; var step = -10; if(leader>=-1200){ leader = leader + step; ul.style.left = leader + ‘px‘; }else{ ul.style.left = "0px"; } }
<script src="common.js"></script> <script> // 1. 先获取要操作的对象 var box = document.getElementById("box"); var ad = box.children[0]; var ul = document.getElementById("imgs"); var lis = ul.children; var ol = ad.children[1]; var arr = document.getElementById("arr"); var arrLeft = document.getElementById("left"); var arrRight = document.getElementById("right"); var imgWidth = ad.offsetWidth; var timerId = null; // 2. 根据图片的个数动态的生成小按钮 for(var i=0;i<lis.length;i++){ var li = document.createElement("li"); li.innerHTML = i+1; ol.appendChild(li); } // 3. 获得所有的ol下的li,然后让第一个变成黄色 var olLis = ol.children; olLis[0].className = "current"; // 4. 当鼠标移入的时候,对应的小方块显示出来 for(var j=0;j<olLis.length;j++){ olLis[j].index = j; olLis[j].onmouseover = function(){ for(var k=0; k<olLis.length;k++){ olLis[k].className = ""; } this.className = "current"; var target = -imgWidth*this.index;// 5. 让图片移动对应的小方块索引的图片宽度的距离 如果小方块的索引为0,则让ul移动0个图片的距离 animate(ul,target); //如果小方块的索引为1,就让ul移动1个图片宽度的距离 //让三者的显示状态同步或是统一起来 pic = square=this.index; //让三者的索引值统一起来 } } // 6. 鼠标移入的时候,显示左右按钮并注册点击事件 box.onmouseover = function(){ arr.style.display = "block"; clearInterval(timerId); //清除定时器 } box.onmouseout = function(){ arr.style.display = ""; timerId = setInterval(playNext,1000); } // 8. 动态添加第一张图片到最后的位置 var imgFirst = lis[0].cloneNode(true); ul.appendChild(imgFirst); // 7. 给左右按钮注册点击事件 var pic=0; //定义一个变量来表示移动的图片个数 也相当于索引 var square =0; //默认显示的小方块的索引 arrRight.onclick = function(){ // if(pic==lis.length-1){ // pic=0; //迅速的让索引编号 等于0 // ul.style.left = "0px"; // 让ul快速的恢复成原来的位置 // } // pic++; // var target = -imgWidth*pic; // sports(ul,target); // // if(square<olLis.length-1){ // square++; // }else{ // square=0; // } // for(var i=0;i<olLis.length;i++){ // olLis[i].className = ""; //将ol下的其它的小方块的颜色全部清除 // } // olLis[square].className = "current"; playNext(); } arrLeft.onclick =function(){ if(pic==0){ pic=lis.length-1; ul.style.left = -imgWidth*pic + "px"; } pic--; var target = -imgWidth*pic; animate(ul,target); if(square>0){ square--; }else{ square = olLis.length-1 } for(var i=0;i<olLis.length;i++){ olLis[i].className = ""; //将ol下的其它的小方块的颜色全部清除 } olLis[square].className = "current"; } //添加自动轮播功能 timerId = setInterval(playNext,1000); function playNext(){ if(pic==lis.length-1){ pic=0; //迅速的让索引编号 等于0 ul.style.left = "0px"; // 让ul快速的恢复成原来的位置 } pic++; var target = -imgWidth*pic; animate(ul,target); if(square<olLis.length-1){ square++; }else{ square=0; } for(var i=0;i<olLis.length;i++){ olLis[i].className = ""; //将ol下的其它的小方块的颜色全部清除 } olLis[square].className = "current"; } </script>
使用JS实现轮播图的效果
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