下面看下js轮播图的实现代码,具体代码如下所示:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
    * {
      padding: 0;
      margin: 0;
      list-style: none;
      border: 0;
    }
    .all {
      width: 500px;
      height: 200px;
      padding: 7px;
      border: 1px solid #ccc;
      margin: 100px auto;
      position: relative;
    }
    .screen {
      width: 500px;
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .screen li {
      width: 500px;
      height: 200px;
      overflow: hidden;
      float: left;
    }
    .screen ul {
      position: absolute;
      left: 0;
      top: 0px;
      width: 3000px;
    }
    .all ol {
      position: absolute;
      right: 10px;
      bottom: 10px;
      line-height: 20px;
      text-align: center;
    }
    .all ol li {
      float: left;
      width: 20px;
      height: 20px;
      background: #fff;
      border: 1px solid #ccc;
      margin-left: 10px;
      cursor: pointer;
    }
    .all ol li.current {
      background: yellow;
    }
    #arr {
      display: none;
    }
    #arr span {
      width: 40px;
      height: 40px;
      position: absolute;
      left: 5px;
      top: 50%;
      margin-top: -20px;
      background: #000;
      cursor: pointer;
      line-height: 40px;
      text-align: center;
      font-weight: bold;
      font-family: '黑体';
      font-size: 30px;
      color: #fff;
      opacity: 0.3;
      border: 1px solid #fff;
    }
    #arr #right {
      right: 5px;
      left: auto;
    }
  </style>
</head>
<body>
<div class="all" id='box'>
  <div class="screen">
    <ul>
      <li><img src="/UploadFiles/2021-04-02/1.jpg">

补充:原生javascript实现banner图自动轮播切换

一般在做banner轮播图的时候都是用jquery,因为代码少,方便,不需要花费很长的时间去获取某个元素作为变量,然后再进行操作,只要一个$就搞定了。但是今天我用原生的javascript做了一下这个轮播效果,感觉还行,以下是部分js源代码,仅供参考!文章底部查看效果演示。

1、鼠标离开banner图,每隔2s切换一次;

2、鼠标滑过下方的小按钮,可以切换图片;

3、鼠标点击左右按钮,可以切换图片。

var oPic,oLi,anniu,aLi,aLength,num,timer,oG,_index,oSpan;
window.onload = function(){
  oPic = document.getElementsByClassName("pic")[0];
  oLi = oPic.getElementsByTagName("li");
  anniu = document.getElementsByClassName("anniu")[0];
  aLi = anniu.getElementsByTagName("li");
  aLength = aLi.length;
  num = 0;
  oG = document.getElementsByClassName("g")[0];
  oSpan = oG.getElementsByTagName("span");
  oLeft = oSpan[0];
  oRight = oSpan[1];
  start();
  oG.onmouseover = end;
  oG.onmouseout = start;
  for(var j=0; j<aLength; j++){
    aLi[j].index = j;
    aLi[j].onmouseover = change;
  }
  oRight.onclick = time;
  oLeft.onclick = times;
}
//自动轮播开始或结束
function start(){
    timer = setInterval(time,2000);
    hide();
}
function end(){
  clearInterval(timer);
  show();
}
//图片切换++
function time(){
  for(var i=0; i<aLength; i++){
    oLi[i].style.display = "none";
    aLi[i].className = "";
  }
  num++;
  num = num % 4;
  oLi[num].style.display = "block";
  aLi[num].className = "on";
}
//图片切换--
function times(){
  for(var i=0; i<aLength; i++){
    oLi[i].style.display = "none";
    aLi[i].className = "";
  }
  num--;
  num = (num+4)%4;
  oLi[num].style.display = "block";
  aLi[num].className = "on";
}
//鼠标滑过按钮,图片轮播
function change(){
  _index = this.index;
  for(var k=0; k<aLength; k++){
    aLi[k].className = "";
    oLi[k].style.display = "none";
  }
  aLi[_index].className = "on";
  oLi[_index].style.display = "block";
}
//左右按钮显示或隐藏
function show(){
  oSpan[0].style.display = "block";
  oSpan[1].style.display = "block";
}
function hide(){
  oSpan[0].style.display = "none";
  oSpan[1].style.display = "none";
}

以上所述是小编给大家介绍的使用原生的javascript来实现轮播图,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

标签:
js,轮播图

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