JavaScript筋斗云案例

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <style>
    * {
      margin: 0;
      padding: 0
    }

    ul {
      list-style: none
    }

    body {
      background-color: #333;
    }

    .nav {
      width: 800px;
      height: 42px;
      margin: 100px auto;
      background: url(images/rss.png) right center no-repeat;
      background-color: #fff;
      border-radius: 10px;
      position: relative;
    }

    .nav li {
      width: 83px;
      height: 42px;
      text-align: center;
      line-height: 42px;
      float: left;
      cursor: pointer;
    }

    .nav span {
      position: absolute;
      top: 0;
      left: 0;
      width: 83px;
      height: 42px;
      background: url(images/cloud.gif) no-repeat;
    }

    ul {
      position: relative;
    }
  </style>
</head>
<body>
<div class="nav">
  <span id="cloud"></span>
  <ul id="navBar">
    <li>北京校区</li>
    <li>上海校区</li>
    <li>广州校区</li>
    <li>深圳校区</li>
    <li>武汉校区</li>
    <li>关于我们</li>
    <li>联系我们</li>
    <li>招贤纳士</li>
  </ul>
</div>
<script src="common.js"></script>
<script>
  //获取所有的li注册鼠标进入、离开、点击事件
  var list = my$("navBar").children;
  for(var i = 0; i < list.length; i++) {
    list[i].onmouseover = mouseoverHandle;
    list[i].onclick = clickHandle;
    list[i].onmouseout = mouseoutHandle;
  }

  //鼠标进入事件
  var left = 0;
  function mouseoverHandle() {
    animate(my$("cloud"), this.offsetLeft);
  }
  //鼠标点击事件
  function clickHandle() {
    left = this.offsetLeft;
  }
  //鼠标离开事件
  function mouseoutHandle() {
    animate(my$("cloud"), left);
  }


  //匀速动画
  function animate(element, target) {
    //清理定时器
    clearInterval(element.timeId);
    element.timeId = setInterval(function () {
      //获取元素的当前位置
      var current = element.offsetLeft;
      //移动的步数
      var step = (target - current) / 10;
      step = step > 0 ? Math.ceil(step) : Math.floor(step);
      current += step;
      element.style.left = current + "px";
      if (current == target) {
        //清理定时器
        clearInterval(element.timeId);
      }
      //测试代码:
      console.log("目标位置:" + target + ",当前位置:" + current + ",每次移动步数:" + step);
    }, 20);
  }
</script>
</body>
</html>
用到的图片
JavaScript筋斗云案例

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