javascript實現點選按鈕切換輪播圖功能

阿新 • • 發佈：2020-09-24

本文例項為大家分享了js實現點選按鈕切換輪播圖的具體程式碼，供大家參考，具體內容如下

選單區域實現

劃過主選單顯示子選單

輪播區域實現

1、點選圖片中左右箭頭，分別跳轉上一張與下一張

（1）點選上一張圖其實就是讓一個變數進行遞減，點選下一張圖就是讓變數遞增；（控制索引最大最小值）
2、點選右下角小圓也可以進行圖片的跳轉

（1）通過索引讓變數進行隨意的修改
3、每間隔3s進行輪播圖的自動切換，滑鼠放在圖片上清除自動切換

（1）定時器

4、滑鼠放在主選單上顯示子選單，離開子選單消失。

放在子選單上顯示子選單，離開消失。

原始碼：

html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>輪播圖</title>
 <link rel="stylesheet" type="text/css" href="css/style.css" />
 <script type="text/javascript" src="js/script.js"></script>
</head>
<body>
 <div class="main" id="main">
 <!-- 主選單背景 -->
 <div class="menu-box"></div>
 <!-- 主選單 -->
 <div class="menu-content" id="menu-content">
 <div class="menu-item">
 <a href="">
  <span>手機、配件</span>
  <i class="icon">&#xe665;</i>
 </a>
 </div>
 <div class="menu-item">
 <a href="">
  <span>電腦</span>
  <i class="icon">&#xe665;</i>
 </a>
 </div>
 <div class="menu-item">
 <a href="">
  <span>家用電器</span>
  <i class="icon">&#xe665;</i>
 </a>
 </div>
 <div class="menu-item">
 <a href="">
  <span>傢俱</span>
  <i class="icon">&#xe665;</i>
 </a>
 </div>
 </div>
 <!-- 子選單 -->
 <div class="sub-menu hide" id="sub-menu">
 <!-- 子選單背景 -->
 <div class="inner-box">
 <!-- 子選單內容 -->
 <div class="sub-inner-box">
  <div class="title">手機、配件</div>
  <div class="sub-row">
  <span class="bold mr10">手機通訊：</span>
  <a href="">手機</a>
  <span class="ml10 mr10">/</span>
  <a href="">手機維修</a>
  <span class="ml10 mr10">/</span>
  <a href="">以舊換新</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">手機配件：</span>
  <a href="">手機殼</a>
  <span class="ml10 mr10">/</span>
  <a href="">手機儲蓄卡</a>
  <span class="ml10 mr10">/</span>
  <a href="">資料線</a>
  <span class="ml10 mr10">/</span>
  <a href="">充電器</a>
  <span class="ml10 mr10">/</span>
  <a href="">電池</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">運營商：</span>
  <a href="">中國聯通</a>
  <span class="ml10 mr10">/</span>
  <a href="">中國移動</a>
  <span class="ml10 mr10">/</span>
  <a href="">中國電信</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">智慧裝置：</span>
  <a href="">智慧手環</a>
  <span class="ml10 mr10">/</span>
  <a href="">智慧家居</a>
  <span class="ml10 mr10">/</span>
  <a href="">智慧手錶</a>
  <span class="ml10 mr10">/</span>
  <a href="">其他配件</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">娛樂：</span>
  <a href="">耳機</a>
  <span class="ml10 mr10">/</span>
  <a href="">音響</a>
  <span class="ml10 mr10">/</span>
  <a href="">收音機</a>
  <span class="ml10 mr10">/</span>
  <a href="">麥克風</a>
  </div>
 </div>
 </div>
 <div class="inner-box">
 <div class="sub-inner-box">
  <div class="title">電腦</div>
  <div class="sub-row">
  <span class="bold mr10">電腦：</span>
  <a href="">筆記本</a>
  <span class="ml10 mr10">/</span>
  <a href="">平板</a>
  <span class="ml10 mr10">/</span>
  <a href="">一體機</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">電腦配件：</span>
  <a href="">顯示器</a>
  <span class="ml10 mr10">/</span>
  <a href="">CPU</a>
  <span class="ml10 mr10">/</span>
  <a href="">主機板</a>
  <span class="ml10 mr10">/</span>
  <a href="">硬碟</a>
  <span class="ml10 mr10">/</span>
  <a href="">電源</a>
  <span class="ml10 mr10">/</span>
  <a href="">顯示卡</a>
  <span class="ml10 mr10">/</span>
  <a href="">其他配件</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">遊戲裝置：</span>
  <a href="">遊戲機</a>
  <span class="ml10 mr10">/</span>
  <a href="">耳機</a>
  <span class="ml10 mr10">/</span>
  <a href="">遊戲軟體</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">網路產品：</span>
  <a href="">路由器</a>
  <span class="ml10 mr10">/</span>
  <a href="">網路機頂盒</a>
  <span class="ml10 mr10">/</span>
  <a href="">交換機</a>
  <span class="ml10 mr10">/</span>
  <a href="">儲存卡</a>
  <span class="ml10 mr10">/</span>
  <a href="">網絡卡</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">外部產品：</span>
  <a href="">滑鼠</a>
  <span class="ml10 mr10">/</span>
  <a href="">鍵盤</a>
  <span class="ml10 mr10">/</span>
  <a href="">U盤</a>
  <span class="ml10 mr10">/</span>
  <a href="">行動硬碟</a>
  <span class="ml10 mr10">/</span>
  <a href="">滑鼠墊</a>
  <span class="ml10 mr10">/</span>
  <a href="">電腦清潔</a>
  </div>
 </div>
 </div>
 <div class="inner-box">
 <div class="sub-inner-box">
  <div class="title">家用電器</div>
  <div class="sub-row">
  <span class="bold mr10">電視：</span>
  <a href="">國產品牌</a>
  <span class="ml10 mr10">/</span>
  <a href="">韓國品牌</a>
  <span class="ml10 mr10">/</span>
  <a href="">歐美品牌</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">空調：</span>
  <a href="">顯示器</a>
  <span class="ml10 mr10">/</span>
  <a href="">櫃式</a>
  <span class="ml10 mr10">/</span>
  <a href="">中央</a>
  <span class="ml10 mr10">/</span>
  <a href="">壁掛式</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">冰箱：</span>
  <a href="">多門</a>
  <span class="ml10 mr10">/</span>
  <a href="">對開門</a>
  <span class="ml10 mr10">/</span>
  <a href="">三門</a>
  <span class="ml10 mr10">/</span>
  <a href="">雙門</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">洗衣機：</span>
  <a href="">滾筒式洗衣機</a>
  <span class="ml10 mr10">/</span>
  <a href="">迷你洗衣機</a>
  <span class="ml10 mr10">/</span>
  <a href="">洗烘一體機</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">廚房電器：</span>
  <a href="">抽菸機</a>
  <span class="ml10 mr10">/</span>
  <a href="">洗碗機</a>
  <span class="ml10 mr10">/</span>
  <a href="">燃氣灶</a>
  </div>
 </div>
 </div>
 <div class="inner-box">
 <div class="sub-inner-box">
  <div class="title">傢俱</div>
  <div class="sub-row">
  <span class="bold mr10">家紡：</span>
  <a href="">被子</a>
  <span class="ml10 mr10">/</span>
  <a href="">枕頭</a>
  <span class="ml10 mr10">/</span>
  <a href="">四件套</a>
  <span class="ml10 mr10">/</span>
  <a href="">床墊</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">燈具：</span>
  <a href="">檯燈</a>
  <span class="ml10 mr10">/</span>
  <a href="">頂燈</a>
  <span class="ml10 mr10">/</span>
  <a href="">節能燈</a>
  <span class="ml10 mr10">/</span>
  <a href="">應急燈</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">廚具：</span>
  <a href="">烹飪鍋具</a>
  <span class="ml10 mr10">/</span>
  <a href="">餐具</a>
  <span class="ml10 mr10">/</span>
  <a href="">菜板刀具</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">家裝：</span>
  <a href="">地毯</a>
  <span class="ml10 mr10">/</span>
  <a href="">沙發墊套</a>
  <span class="ml10 mr10">/</span>
  <a href="">裝飾字畫</a>
  <span class="ml10 mr10">/</span>
  <a href="">照片牆</a>
  <span class="ml10 mr10">/</span>
  <a href="">窗簾</a>
  </div>
  <div class="sub-row">
  <span class="bold mr10">生活日用：</span>
  <a href="">收納用品</a>
  <span class="ml10 mr10">/</span>
  <a href="">浴室用品</a>
  <span class="ml10 mr10">/</span>
  <a href="">雨傘雨衣</a>
  </div>
 </div>
 </div>
 </div>
 <!-- 焦點圖 -->
 <div class="banner" id="banner">
 <!-- 滑鼠懸停停止自動輪播的區域 -->
 <section class="cease" id="cease"></section>
 <a href="">
 <div class="banner-slide slide1"></div>
 </a>
 <a href="">
 <div class="banner-slide slide2"></div>
 </a>
 <a href="">
 <div class="banner-slide slide3"></div>
 </a>
 </div>
 <!-- 按鈕 -->
 <a href="javascript:void(0)" class="button prev" id="prev"></a>
 <a href="javascript:void(0)" class="button next" id="next"></a>
 <div class="dots" id="dots">
 <span class="active"></span>
 <span></span>
 <span></span>
 </div>
 </div>
</body>
</html>

css

*{
 margin: 0;
 padding: 0;
}
/*萬用字元選擇器，外邊距，內邊距為0*/
body{
 font-family: "微軟雅黑";
 color: #14191e;
}
/*字型，字型顏色*/
@font-face{
 font-family: 'iconfont';/*自定義名稱，要有意義，不準數字*/
 src: url('../font/iconfont.eot');/*相容ie9以上版本*/
 src: url('../font/iconfont.eot?#iefix') format('embedded-opentype'),/*相容ie6-8版本*/
 url('../font/iconfont.ttf') format('truetype'),/*主要針對手機端瀏覽器 safari android ios*/
 url('../font/iconfont.woff') format('woff'),/*相容所有瀏覽器 */
 url('../font/iconfont.svg#iconfont') format('svg');/*針對ios端開發 legacy ios*/
/* font-weight: bold;<字型加粗>
 font-style: normal;預設的正常顯示*/
}
/*獲取下載的字型*/
a{
 text-decoration: none;
}
/*沒有下劃線*/
a:link,a:visited{
 color: #5e5e5e;
}
/*聯合選擇器，未訪問連線時與已經訪問連結時的字型顏色*/
.main{
 width: 1200px;
 height: 460px;
 margin: 30px auto;
 overflow: hidden;
 position: relative;
}
/*最大框架：寬；高；外邊距，上下30px，左右居中；溢位的部分隱藏；相對定位*/
.banner{
 width: 1200px;
 height: 460px;
 overflow: hidden;
 cursor: pointer;
}
/*焦點圖：寬；高；溢位的部分隱藏；小手標誌*/
.banner-slide{
 width: 1200px;
 height: 460px;
 float: right;
 background-repeat: no-repeat;
 display: none;
}
/*三個圖片：寬；高；右浮動，背景不重複;全部隱藏*/

.slide1{
 background-image: url(../img/bg1.jpg);
 display: block;
}
/*第一個圖片;塊級元素顯示*/
.slide2{
 background-image: url(../img/bg2.jpg);
}
/*第二個圖片*/
.slide3{
 background-image: url(../img/bg3.jpg);
}
/*第三個圖片*/
.button{
 position: absolute;
 width: 40px;
 height: 80px;
 right: 0;
 background: url(../img/arrow.png) center center no-repeat;
 top: 50%;
 margin-top: -40px;
}
/*左右兩個按鈕；寬；高；相對main絕對定位，距右0，距上50%；背景圖片，水平垂直居中，不重複；外上邊距-40px；*/
.button:hover{
 background-color: #333;
 opacity: 0.8;
 filter: alpha(opacity=80);
}
/*滑鼠懸浮在上面時狀態：背景顏色，透明度。照顧IE瀏覽器*/
.prev{
 left: 244px;
 -webkit-transform: rotate(180deg);
 -moz-transform: rotate(180deg);
  -ms-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg);
}
/*左按鈕相對上面：靠左244px，定位左的優先順序高於右；旋轉180度*/
.dots{
 position: absolute;
 right: 24px;
 bottom: 24px;
 line-height: 12px;
}
/*下面三個選擇圓：相對main絕對定位，距右，距下，行間距12px；*/
.dots span{
 display: inline-block;
 width: 12px;
 height: 12px;
 border-radius: 50%;
 background-color: rgba(7,17,27,.4);
 margin-left: 8px;
 box-shadow: 0 0 0 2px rgba(255,255,.8) inset;
 cursor: pointer;
}
/*子孫後代選擇器：轉換為塊級元素並列一排；寬；高；削圓；背景顏色；外左邊距，讓他們之間有距離；盒子陰影，水平偏移量，垂直偏移量，模糊度，擴充套件多少，顏色模糊度，內陰影;小手標誌*/
.dots .active{
 background-color: #fff;
 box-shadow: 0 0 0 2px rgba(255,.4) inset;
}
/*背景顏色，同上*/
.menu-box{
 position: absolute;
 left: 0;
 top: 0;
 width: 244px;
 height: 460px;
 background: rgba(7,.3);
 z-index: 1;
}
/*主選單背景，相對main絕對定位，左上偏移；寬；高；背景顏色模糊度；層疊模式數字大的在上面顯示*/
.menu-content{
 position: absolute;
 left: 0;
 top: 0;
 width: 244px;
 height: 460px;
 z-index: 2;
}
/*主選單（因為選單不需要模糊度所以單獨拿出來設定css樣式）*/
.menu-item{
 height: 64px;
 line-height: 66px;
 cursor: pointer;
 padding: 0 24px;
}
/*主選單的每個標題，寬；行間距；因為是連結，浮在上面顯示小手標誌；內邊距，上下0，左右24px；下劃線兩邊留空*/
.menu-item a{
 display: block;
 color: #fff;
 font-size: 16px;
 border-bottom: 1px solid rgba(255,.2);
 height: 63px;
 position: relative;
}
/*轉換為塊級元素；字型顏色；字型大小；下邊框，粗細，實線，顏色透明度；高；相對定位*/
.menu-item:last-child a{
 border-bottom:none;
}
/*menu-item的最後一個元素a；沒有下邊框*/
.menu-item i{
 position: absolute;
 right: 12px;
 top: 2px;
 color: rgba(255,.5);
 font-style: normal;
 font-weight: normal;
 font-family: "iconfont";
 font-size: 24px;
}
/*子孫後代選擇器：相對a絕對定位；右下偏移；字型顏色模糊度；沒有斜體；沒有加粗；字型；字型大小*/
.sub-menu{
 width: 730px;
 height: 458px;
 position: absolute;
 left: 244px;
 top: 0;
 background: #fff;
 z-index: 50;
 border: 1px solid #d9dde1;
 box-shadow: 0 4px 8px 0px rgba(0,.1);
}
/*子選單：寬；高；相對main絕對定位，左上偏移；背景顏色；層疊模式數字大的在上面顯示；邊框；盒子陰影*/
.inner-box{
 width: 100%;
 height: 100%;
 background: url(../img/fe.png);
 display: none;
}
/*子選單背景：寬；高；背景圖片;全部隱藏*/
.sub-inner-box{
 width: 652px;
 margin-left: 40px;
 overflow: hidden;
}
/*子選單內容；寬；外左邊距；溢位的內容隱藏*/
.title{
 font-size: 16px;
 color: #f01414;
 line-height: 16px;
 font-weight: bold;
 margin: 28px 0 30px 0;
}
/*子選單內容的標題：字型大小；顏色；行高；粗體；外邊距*/
.sub-row{
 margin-bottom: 25px;
}
/*子選單內容：外下邊距讓他們之間有距離*/
.bold{
 font-weight: bold;
}
/*子標題：字型加粗*/
.ml10{
 margin-left: 10px;
}
/*內容和斜槓之間的左邊距離*/
.mr10{
 margin-right: 10px;
}
/*內容、子標題和斜槓之間的右邊距離*/
.hide{
 display: none;
}
/*隱藏子選單*/

// 宣告全域性變數
window.onload=function(){
 var index = 0,//當前顯示圖片的索引，預設值為0
 timer = null,//定時器
 cease = byId("cease"),//滑鼠懸停停止自動輪播的區域
 prev = byId("prev"),//上一張
 next = byId("next"),//下一張
 banner = byId("banner"),//焦點圖的爺爺
 pics = banner.getElementsByTagName('div'),//焦點圖
 dots = byId("dots").getElementsByTagName('span'),//圓點
 menuContent = byId("menu-content"),//主選單
 menuItems = menuContent.getElementsByClassName("menu-item"),//主選單的標題
 subMenu = byId("sub-menu"),//子選單
 innerBox = subMenu.getElementsByClassName("inner-box"),//子選單的標題
 mlen = menuItems.length,size = pics.length,llen = innerBox.length;
 // console.log(size);




console.log(lis_1[0]);
lis_1[0].onclick = function(){
 department.className = 'hide'
 hospital.className = 'hospital'
 lis_1[0].className = 'li_1'
}
lis_1[1].onclick = function(){
 department.className = ''
 hospital.className = 'hospital hide'
 lis_1[1].className = 'li_1'
}


//封裝getElementById（）三元運算子
function byId(id){
 return typeof(id) === "string" ? document.getElementById(id):id;
}

/*封裝通用事件繫結方法；
 element繫結事件的DOM元素
 事件名
 事件處理程式
*/
function addHandler(element,type,handler){
 //針對非IE瀏覽器
 if (element,addEventListener) {
 element.addEventListener(type,handler,true);
 } //IE瀏覽器支援DOM2級
 else if (element,attachEvent) {
 element.attachEvent('on' + type,handler);
 } //IE瀏覽器不支援DOM2級，使用DOM0級
 else{
 element['on' + type] = handler;
 //變數不可以.type，事件可以.；
 }
}

//封裝函式，切換圖片
function changImg(){
 //遍歷所有圖片，將圖片隱藏，將圓點上的類清除
 for(var i=0;i<size;i++){
 pics[i].style.display = 'none';
 dots[i].className = "";
 }
 //顯示當前圖片
 pics[index].style.display = 'block';
 //當前圓點高亮顯示
 dots[index].className = "active";
}

// 點選下一張按鈕顯示下一張圖片
addHandler(next,"click",function(){
 index++;
 if (index>=size) index = 0;
 changImg();
});

// 點選上一張按鈕顯示上一張圖片
addHandler(prev,function(){
 index--;
 if (index<0) index = size-1;
 changImg();
});

//點選圓點索引切換圖片
for(var j=0;j<size;j++){
 dots[j].setAttribute('tid',j);
 addHandler(dots[j],'click',function(){
 //自定義屬性不可以直接點，需用getAttribute
 index = this.getAttribute('tid');
 changImg();
 })
}

//定時器,開啟自動輪播
function startAutoPlay(){
 timer = setInterval(function(){
 index++;
 if (index>=size) index = 0;
 changImg();
 },3000)
}

//清除定時器，停止自動輪播
function ceaseAutoPlay(){
 if(timer){
 clearInterval(timer);
 }
}

//封裝函式，取消所有主選單背景
function bgNone(){
 for(var n=0;n<mlen;n++){
 menuItems[n].style.background = 'none';
 }
}

//封裝函式，子選單和主選單背景顯示
function menuItemsBg(){
 //顯示子選單所在的背景
 subMenu.className = "sub-menu";
 //獲取當前主選單的索引
 index = this.getAttribute('data-index');
 //遍歷所有的子選單innerbox，將它們隱藏
 for(var l=0;l<llen;l++){
 //隱藏所有的子選單
 innerBox[l].style.display = "none";
 //所有主選單取消背景
 menuItems[l].style.background = 'none';
 }
 //找到當前子選單，讓其顯示出來
 innerBox[index].style.display = "block";
 //當前主選單顯示背景
 menuItems[index].style.background = 'rgba(0,.1)';
}

//滑鼠滑過主選單和子選單
for(var k=0;k<mlen;k++){
 //給所有主選單定義屬性，表明它的索引
 menuItems[k].setAttribute('data-index',k);
 //給所有子選單定義屬性，表明它的索引
 innerBox[k].setAttribute('data-index',k);
 addHandler(menuItems[k],"mouseover",menuItemsBg)
 addHandler(innerBox[k],menuItemsBg)
}

//滑鼠滑入子選單，顯示子選單
addHandler(subMenu,function(){
 subMenu.className = "sub-menu";
})

//滑鼠離開主選單，隱藏子選單
addHandler(menuContent,"mouseout",function(){
 subMenu.className = "sub-menu hide";
 bgNone(); 
})

//滑鼠離開子選單，隱藏子選單
addHandler(subMenu,function(){
 subMenu.className = "sub-menu hide";
 bgNone();
})

//滑鼠滑入cease，停止輪播
addHandler(cease,ceaseAutoPlay);
//滑鼠離開cease，繼續輪播
addHandler(cease,startAutoPlay);

//自動開啟輪播
startAutoPlay();

}

精彩專題分享：jQuery圖片輪播 JavaScript圖片輪播 Bootstrap圖片輪播

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