带有定时器的无缝轮播图

来源：互联网发布：查询父级部门 mysql 编辑：程序博客网时间：2024/05/02 02:51
<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>带有定时器的无缝轮播图</title></head><style>    * {        padding: 0;        margin: 0;    }    .box{        width: 500px;        height: 200px;        padding:5px;        border:1px solid #ccc;        margin: 200px auto;    }    .inner{        width: 500px;        height: 200px;        overflow: hidden;        position: relative;    }    ul {        width:3500px;        list-style: none;        position: absolute;        left:0;    }    ul li {        float: left;    }    .square{        position: absolute;        bottom: 10px;        right: 10px;    }    ol li {        display: inline-block;        list-style:  none;        width: 20px;        height: 20px;        text-align: center;        cursor: pointer;        background-color: #fff;        border:1px solid #ccc;        margin: 0 5px;    }    .arrow {        display: none;    }    .arrow .left {        position: absolute;        width: 25px;        height: 25px;        background-color: #ddd;        border:1px solid #fff;        line-height: 25px;        top:50%;        left: 0;        text-align: center;        cursor: pointer;    }    .arrow .right {        position: absolute;        width: 25px;        height: 25px;        background-color: #ddd;        border:1px solid #fff;        line-height: 25px;        top:50%;        right:0;        text-align: center;        cursor: pointer;    }    .current {        background-color: yellow;    }</style><body>    <div class="box">        <div class="inner">            <ul>                <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>            <!--指示器-->            <div class="square">                <ol></ol>            </div>            <!--箭头 -->            <div class="arrow">                <span class="left"><</span>                <span class="right">></span>            </div>        </div>    </div>    <script>        //1.获取事件源及相关元素        var box =  document.getElementsByClassName("box")[0];        var inner  = box.children[0];        var imgWidth = inner.offsetWidth;        console.log(imgWidth);        var ul = inner.children[0];        var ol = inner.children[1].children[0];        var arrow = inner.children[2];        var spanArr = arrow.children;        var liArr = inner.children[0].children;        //2.复制第一张图片所在的li,添加到ul的最后面。        var ulNewLi = ul.children[0].cloneNode(true);        ul.appendChild(ulNewLi);        //3.给ol中添加li，ul中的个数-1个，并点亮第一个按钮。因为复制了一个li        for(var i=0 ;i<liArr.length-1;i++){            var newLi = document.createElement("li");            newLi.innerHTML += i+1 ;            ol.appendChild(newLi);        }        var olLiArr = ol.children;        olLiArr[0].className = "current";        //4.鼠标放到ol的li上切换图片(排他思想)        for(var i=0 ;i<olLiArr.length;i++){            olLiArr[i].index = i;            olLiArr[i].onmouseover = function(){                for(var j=0;j<olLiArr.length;j++){                    olLiArr[j].className = "";                }                this.className = "current";                //鼠标放到小的方块上的时候索引值和key以及square同步//                    key = this.index;//                    square = this.index;                key = square = this.index;                //移动盒子                animate(ul,-this.index*imgWidth);            }        }        // 5.添加定时器        var timer = setInterval(autoPlay,1000);        // 固定向右切换图片        // 两个定时器（一个记录图片，一个记录小方块）        var key = 0 ;        var square = 0;        function autoPlay(){            key++;            if(key > olLiArr.length){                // 图片已经滑动到最后一张，接下来，跳转到第一张，然后滑动到第二张                ul.style.left  = 0 ;                key =1 ;            }            animate(ul,-key*imgWidth);            square++;            if(square>olLiArr.length-1){                square = 0;            }            for(var i = 0 ;i<olLiArr.length;i++){                olLiArr[i].className = "";            }            olLiArr[square].className = "current";        }        // 鼠标放上去清除定时器，一开后在开启定时器        box.onmouseover = function(){            arrow.style.display = "block";            clearInterval(timer);        };        box.onmouseout = function(){            arrow.style.display = "none";            timer = setInterval(autoPlay,1000);        };        // 6. 左右切换图片        spanArr[0].onclick = function () {            //通过控制key的自增来模拟图片的索引值，然后移动ul            key--;            if(key<0){                //先移动到最后一张，然后key的值取之前一张的索引值，然后在向前移动                ul.style.left = -imgWidth*(olLiArr.length)+"px";                key = olLiArr.length-1;            }            animate(ul,-key*imgWidth);            //通过控制square的自增来模拟小方块的索引值，然后点亮盒子            //排他思想做小方块            square--;            if(square<0){//索引值不能大于等于5，如果等于5，立刻变为0；                square = olLiArr.length-1;            }            for(var i=0;i<olLiArr.length;i++){                olLiArr[i].className = "";            }            olLiArr[square].className = "current";        }        spanArr[1].onclick = function () {            //右侧的和定时器一模一样            autoPlay();        }        // 封装匀速动画函数        function animate(ele,target){            clearInterval(ele.timer);            var speed = target>ele.offsetLeft?10:-10;            ele.timer = setInterval(function () {                var val = target - ele.offsetLeft;                ele.style.left = ele.offsetLeft + speed + "px";                if(Math.abs(val)<Math.abs(speed)){                    ele.style.left = target + "px";                    clearInterval(ele.timer);                }            },10)        }    </script></body></html>
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