利用JS做网页特效_大图轮播(实例讲解)

废话不多说，直接上代码：
<style>
      * {
        margin: 0px;
        padding: 0px;
      }
      
      .stage {
        width: 500px;
        height: 300px;
        border: 5px solid black;
        margin: 200px;
        position: relative;
        overflow: hidden;
      }
      
      .to-left,
      .to-right {
        position: absolute;
        top: 0px;
        width: 50px;
        height: 300px;
        background-color: black;
        color: white;
        font-size: 30px;
        text-align: center;
        line-height: 300px;
        opacity: 0.3;
      }
      
      .to-left {
        left: 0px;
      }
      
      .to-right {
        right: 0px;
      }
      
      .to-left:hover,
      .to-right:hover {
        cursor: pointer;
        opacity: 0.5;
      }
      
      .banner {
        width: 3000px;
        height: 300px;
      }
      
      .items {
        float: left;
        width: 500px;
        height: 300px;
        background-color: blanchedalmond;
        font-size: 100px;
        text-align: center;
        line-height: 300px;
      }
    </style>
  </head>
<!--大图轮播特效-->
  <body>
    <div class="stage">
      <div class="to-left">
        <</div>
          <div class="to-right">></div>
          <div class="banner">
            <div class="items">1</div>
            <div class="items" style="">2</div>
            <div class="items" style="">3</div>
            <div class="items" style="">4</div>
            <div class="items" style="">5</div>
            <div class="items">1</div>
          </div>
      </div>
  </body>

</html>
<script>
  var to_right = document.getElementsByClassName('to-right')[0];
  var to_left = document.getElementsByClassName('to-left')[0];
  var banner = document.getElementsByClassName('banner')[0];
  var arr = [];
  var count = 1;

  to_right.onclick = function() {
    toRight();
  }
  
  function toRight(){
    arr.push(window.setInterval("moveLeft()", 30));
  }
  
  to_left.onclick = function() {
    toLeft();
  }

  function toLeft(){
    arr.push(window.setInterval("moveRight()", 30));
  }
  
  function moveLeft() {
    if(count < 5) {
      if(banner.offsetLeft > count * (-500)) {
        banner.style.marginLeft = banner.offsetLeft - 20 + "px";
      } else {
        for(var x in arr) {
          window.clearInterval(arr[x]);
        }
        count++;
      }
//  连接点
    }else{
      if(banner.offsetLeft > count * (-500)) {
        banner.style.marginLeft = banner.offsetLeft - 20 + "px";
      } else {
        for(var x in arr) {
          window.clearInterval(arr[x]);
        }
        count = 1;
        banner.style.marginLeft = 0 + 'px';
      }
    }
  }
  
  function moveRight() {
    if(count-1 >0) {
      if(banner.offsetLeft < (count-2) * (-500)) {
        banner.style.marginLeft = banner.offsetLeft + 20 + "px";
      } else {
        for(var x in arr) {
          window.clearInterval(arr[x]);
        }
        count--;
      }
    }
  }
  window.setInterval("toRight()",1750);
  

</script>
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