javascript实现图片轮播效果代码

2016-01-22 网页编程网 网页编程网

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Document</title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.wrap{
     width: 510px;
     margin: 0 auto;
     overflow: hidden;
      position: relative;
   }
   .caktye{
     width: 9999px;
     overflow: hidden;
     position: relative;
     left: 0;
   }
   .main{
     text-align: center;
      position: absolute;
      bottom: 10px;
      /*border: 1px solid red;*/
      left: 35%;
 
   }
   .main button{
     width: 25px;
      height: 25px;
      text-align: center;
      line-height: 25px;
      border-radius: 25px;
      display: inline-block;
      border: none;
   }
   .active{
     background-color: yellow;
   }
   .caktye a{
     float: left;
   }
   .caktye img {
      display: block;
      width:510px;
    }
   #prevBtn{
        display: block;
        position: absolute;
        left: 5px;
        bottom: 45%;
      width: 15px;
      height: 15px;
      /*overflow: hidden;*/
      border-left: 5px solid ;
      border-top: 5px solid ;
       border-color: rgba(255,255,255,0.5);
      -webkit-transform: rotate(45deg);
      transform: rotate(-45deg);
   }
   #nextBtn{
      display: block;
      position: absolute;
      right: 5px;
      bottom: 45%;
      width: 15px;
      height: 15px;
      /*overflow: hidden;*/
      border-right: 5px solid;
      border-top: 5px solid;
      -webkit-transform: rotate(45deg);
      transform: rotate(45deg);
      border-color: rgba(255,255,255,0.5);
      /*background-color: rgba(255,255,255,0.8);*/
   }
 
  </style>
</head>
<body>
  
  <div class="wrap">
   <div class="caktye" id="inner">
    <a href="###"><img src="img/1.jpg"></a>
    <a href="###"><img src="img/2.jpg"></a>
    <a href="###"><img src="img/3.jpg"></a>
    <a href="###"><img src="img/4.jpg"></a>
    <a href="###"><img src="img/5.jpg"></a>
      <a href="###"><img src="img/1.jpg"></a>
   </div>
    <div class="main">
      <button class="active">1</button>
      <button>2</button>
      <button>3</button>
      <button>4</button>
      <button>5</button>
   </div>
   <div>
      <a href="###" id="prevBtn"></a>
      <a href="###" id="nextBtn"></a>
 
   </div>
  </div>   
  <script type="text/javascript">
   var innerList = document.getElementById("inner");
   var btnList = document.getElementsByTagName("button");
   var perWidth = inner.children[0].offsetWidth;
   var prevBtn = document.getElementById("prevBtn");
   var nextBtn = document.getElementById("nextBtn");
   // var imgList = inner.getElementsByTagName("img");
    
   // var perWidth = imgList[0].offsetWidth;
   var timer = 0;
   var timer1 = 0;
   var index =0;
   var runFlag = true; //设置一个动画是否走完的标志位
 
   for(var i = 0; i < btnList.length; i++) {
      btnList[i].index = i;
      btnList[i].onclick = function() {
         index = this.index;
          
         tab();
      }
   }
   function tab() {
      var start = inner.offsetLeft;
      var end = - perWidth * index;
      var change = end - start;
      var t = 0;
      var maxT = 30;
 
      clearInterval(timer1);
      timer1 = setInterval(function() {
         t++;
         if(t >= maxT) {
            clearInterval(timer1);
            // alert("停下来了");
            runFlag = true;
         }
         inner.style.left = change/maxT * t + start + "px";
         if(index == btnList.length && t >= maxT) {
            inner.style.left = 0;
         }
      },30)
 
      // inner.style.left = - perWidth * index + "px";
      for(var j = 0; j < btnList.length; j++) {
         btnList[j].className = "";
      }
      if(index >= btnList.length) {
         btnList[0].className = "active";
      }else {
         btnList[index].className = "active";
      }
       
   }
    function xunhuan(){
       index++;
    
         if(index>btnList.length){
         index=1;
         }
         // inner.style.left = - perWidth * index + "px";
       tab();
   }
 
   var timer =setInterval(xunhuan,5000);
 
   inner.onmouseover =function(){
   clearInterval(timer);
   }
   inner.onmouseout =function(){
    timer = setInterval(xunhuan,5000);
   }
 
   function next() {
      index++;
      if(index > btnList.length) {
         index = 1;
      }
      tab();
   }
   function prev() {
      index--;
      if(index < 0 ) {
         index = btnList.length - 1;
         inner.style.left = - btnList.length * perWidth + "px";
         console.log(index);
      }
      tab();
   }
   //下一张
   nextBtn.onclick = function() {
      clearInterval(timer);
      if(runFlag) {
         next();
      }
      runFlag = false;
       
   }
   //上一张
   prevBtn.onclick = function() {
      clearInterval(timer);
      if(runFlag) {
         prev();
      }
      runFlag = false;
       
   }
  </script>
</body></html>

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