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js 轮播图

​ 肥学   ​ 人气:0

一、轮番图

效果展示:

轮播图是指在一个模块或者窗口,通过鼠标点击或手指滑动后,可以看到多张图片。这些图片统称为轮播图,这个模块叫做轮播模块。

二、源码展示

设置body

<body>
  <div class="m-view">
    <div class="slide" style="left: -800px">
      <img src="1.jpg" alt="4">
      <img src="2.jpg" alt="0">
      <img src="3.jpg" alt="1">
      <img src="4.jpg" alt="2">
      <img src="5.jpg" alt="3">
      <img src="3.jpg" alt="4">
      <img src="2.jpg" alt="0">
    </div>
    <div class="prev"><</div>
    <div class="next">></div>
    <div class="pointer">
      <span class="button on" index="0"></span>
      <span class="button" index="1"></span>
      <span class="button" index="2"></span>
      <span class="button" index="3"></span>
      <span class="button" index="4"></span>
    </div>
  </div>

样式设置

<style>
    .m-view,.m-view .slide img{
      position: relative;/*作为绝对定位的父元素*/
      width: 500px;
      height: 300px;
    }
    .m-view{
      overflow: hidden;/*将超出该div的子元素隐藏*/
    }
    .m-view .slide{
      position: absolute;
      width: 500px;
      height: 300px;
    }
    .m-view .slide img{
      margin-right: -5px;
    }
    .m-view .prev,.m-view .next{
      position: absolute;
      top: 40%;
      font: 60px/60px Microsoft YaHei;
      color: #00BFFF;
    }
    .m-view .prev{
      left: 10px;
    }
    .m-view .next{
      right: 10px;
    }
    .m-view .pointer{
      position: absolute;
      bottom: 40px;
      left: 33%;
    }
    .m-view .pointer span{
      display: inline-block;/*水平排列*/
      width: 40px;
      height: 40px;
      border-radius: 20px;
      margin-right: 10px;
      background-color: #00FF00;
    }
    .m-view .pointer .on{/*点亮当前图片对应的圆圈*/
      background-color: #1E90FF;
    }
    img{
      object-fit: contain;
    }
  </style>

实现轮番

  var view=document.getElementsByClassName('m-view')[0];
    var slide=document.getElementsByClassName('slide')[0];
    var prev=document.getElementsByClassName('prev')[0];
    var next=document.getElementsByClassName('next')[0];
    var button=document.getElementsByClassName('button');
    var curIndex=0;//当前图片的索引位置
    var toggled=true;//是否正在切换,true表明切换已完成,此时才能切换
    /* Toggle函数实现切换一张图片的功能 */
    function Toggle () {
      var TIMER=50;//滑动一次所用的时间,它是setInterval的第二个参数
      var time=800;//每切换一张图片总共用的时长
      var times=time/TIMER;//每切换一张图片需滑动的次数
      var stepLenth=800/times;//每次滑动的步长
      var leftToggle=function () {
        var t1=times;
        function leftStep(){
          slide.style.left=parseInt(slide.style.left)+stepLenth+"px";
          t1--;
          if (!t1) {
            clearInterval(interval);
            curIndex--;
            if (curIndex<0) {
              slide.style.left=parseInt(slide.style.left)-4000+"px";
              curIndex=4;
            };
            toggled=true;
          };
        };
        if (toggled==true) {
          toggled=false;
          button[curIndex].className="button";
          if (curIndex!=0) {
            button[curIndex-1].className="button on";
          }else{
            button[curIndex+4].className="button on";
          }
          var interval=setInterval(leftStep,TIMER);
        };
      };
      var rightToggle=function () {
        var t2=times;
        function leftStep(){
          slide.style.left=parseInt(slide.style.left)-stepLenth+"px";
          t2--;
          if (!t2) {
            clearInterval(interval);
            curIndex++;
            if (curIndex>4) {
              slide.style.left=parseInt(slide.style.left)+4000+"px";
              curIndex=0;
            };
            toggled=true;
          };
        };
        if (toggled==true) {
          toggled=false;
          button[curIndex].className="button";
          if (curIndex!=4) {
            button[curIndex+1].className="button on";
          }else{
            button[curIndex-4].className="button on";
          };
          var interval=setInterval(leftStep,TIMER);
        };
      }
      this.leftToggle=leftToggle;//输出对外的接口
      this.rightToggle=rightToggle;
    };
    var toggle=new Toggle();
    prev.onclick=function () {
      toggle.leftToggle();
    };
    next.onclick=function () {
      toggle.rightToggle();
    };
    /* 点击圆圈跳转功能 */
    for (var i = 0; i < button.length; i++) {
      button[i].onclick=function () {
        var newIndex=parseInt(this.getAttribute("index"));
        if (newIndex!=curIndex) {
          var distance=-800*(newIndex-curIndex);
          slide.style.left=parseInt(slide.style.left)+distance+"px";
          button[curIndex].className="button";
          button[newIndex].className="button on";
          curIndex=newIndex;
        };
      };
    }
    /* 自动播放功能,鼠标移上去停止播放,移开再次播放 */
    var intervalo=setInterval(toggle.rightToggle,3000);
    view.onmouseover=function () {
      clearInterval(intervalo);
    }
    view.onmouseout=function () {
      intervalo=setInterval(toggle.rightToggle,3000);
    }

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