JS 实现banner图的滚动和选择效果

时间:2021-12-15 04:07:04

CSS+JS实现banner图滚动和点击切换

HTML 部分代码:

<body>

<div id="banner">
  <div id="inside"><img src="img/banner1.png" id="img1" /><img src="img/banner2.png" id="img2" /><img src="img/banner3.png" id="img3" /><img src="img/banner4.png" id="img4" /><img src="img/banner1.png" id="img5" />
</div> <ul id="bannerNum">
  <li onclick="changeBanner(1)">1</li>
  <li onclick="changeBanner(2)">2</li>
  <li onclick="changeBanner(3)">3</li>
  <li onclick="changeBanner(4)">4</li>
</ul>
</div> </body>

CSS代码:

<style type="text/css">
*{
padding: 0px;
margin: 0px;
} #banner{
width: 100%;
overflow: hidden;
white-space: nowrap;
position: relative;
} #banner #inside{
width: 9600px;
position: relative;
left: 50%;
margin-left: -960px;
transition: all 1s ease;
} #banner img{
width: 1920px;
} #bannerNum{
padding: 0px;
list-style: none;
overflow: hidden;
width: 160px;
position: absolute;
bottom: 30px;
right: 50px;
} #bannerNum li{
width: 30px;
height: 30px;
background-color: white;
text-align: center;
line-height: 30px;
margin: 0px 5px;
float: left;
cursor: pointer;
} </style>

JS 部分代码:

<script>
  var num = 1;
  var inside;
  window.onload = function(){   inside = document.getElementById("inside");   var interval = setInterval(function(){
    inside.style.transition = "all 1s ease";
    num++;
    switch (num){
    case 1:
    inside.style.transition = "none";
    inside.style.marginLeft = (-960)+"px";
    break;
    case 2:
    inside.style.marginLeft = (-960-1920)+"px";
    break;
    case 3:
    inside.style.marginLeft = (-960-1920*2)+"px";
    break;
    case 4:
    inside.style.marginLeft = (-960-1920*3)+"px";
    break;
    case 5:
    inside.style.marginLeft = (-960-1920*4)+"px";
    num = 0;
    break;
    default:
    break;
    }
    },2000);
  }   function changeBanner(num1){
    inside.style.transition = "none";
    switch (num1){
    case 1:
    inside.style.marginLeft = (-960)+"px";
    break;
    case 2:
    inside.style.marginLeft = (-960-1920)+"px";
    break;
    case 3:
    inside.style.marginLeft = (-960-1920*2)+"px";
    break;
    case 4:
    inside.style.marginLeft = (-960-1920*3)+"px";
    break;
    default:
    break;
    }   num = num1-1;   }
</script>