基于JavaScript实现图片连播和联级菜单实例代码

<!DOCTYPE html>
<html>
 <head>
 <title>图片轮播</title>
 <style>
  div{
  border: 1px solid red;
  width:218px;
  height: 218px;
  }
  .show{
  display: inline-block;
  }
  .hide{
  display: none;
  }
 </style>
 <meta charset="UTF-8">
 </head>
 <body>
 <!-- onmouseover="" 鼠标悬停事件
  onmouseout="" 鼠标离开事件-->
 <div onmouseover="pause1();" onmouseout="lunbo();">
  <img src="../images/01.jpg" class="show"/>
  <img src="../images/02.jpg" class="hide"/>
  <img src="../images/03.jpg" class="hide"/>
  <img src="../images/04.jpg" class="hide"/>
  <img src="../images/05.jpg" class="hide"/>
  <img src="../images/06.jpg" class="hide"/>
 </div>
 <script>
  //轮播
  var id = null;
  var index = 0;
  function lunbo() {
   //轮播次数
   id = setInterval(function () {
    index++;
    //获取所有图片
    var imgs = document.getElementsByTagName("img");
    //将他们隐藏
    for (var i = 0; i < imgs.length; i++) {
     imgs[i].className = "hide";
    }
    //将下一张隐藏
    var next = index % imgs.length;
    imgs[next].className = "show";
   }, 2000);
  }
  function pause1() {
   clearInterval(id);
  }
  //在页面加载后自动轮播
  lunbo();
 </script>
 </body>
</html>

联级菜单实现

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- <script type="text/javascript" src="demo6.js">
</script> -->
<title>联动菜单</title>
</head>
<body>
 省：
 <select id="province" onchange="chg();">
  <option value="-1">请选择</option>
  <option value="0">河北省</option>
  <option value="1">山东省</option>
  <option value="2">山西省</option>
 </select>
 市：
 <select id="city">
  <option>请选择</option>
 </select>
 <script>
  // 模拟加载城市
 function loadCities() {
 return[
  ["石家庄","廊坊","保定"],
  ["济南","青岛","德州"],
  ["太原","大同","阳泉"]
 ];
 }
 var cities=loadCities();
 console.log(cities);
 function chg() {
  var sel1=document.getElementById("province");
  //获取省份
  var pindex=sel1.value;
  //获取该省份的城市
  var pcities=cities[pindex];
  console.log(pcities);
  //删除城市下拉列表中的所有城市
  var sel2=document.getElementById("city");
  var options=sel2.getElementsByTagName("option");
  console.log(options);
  for(var i=options.length-1;i;i--){
   sel2.removeChild(options[i]);
  }
  //在增加该省份城市
  if(pcities){
   for(var i=0;i<pcities.length;i++){
    var opn=document.createElement("option");
    opn.innerHTML=pcities[i];
    sel2.appendChild(opn);
   }
  }
 }
 </script>
</body>
</html>

总结

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