DIV CSS 佈局教程網

 DIV+CSS佈局教程網 >> 網頁腳本 >> JavaScript入門知識 >> 關於JavaScript >> 原生js實現網易輪播圖效果
原生js實現網易輪播圖效果
編輯:關於JavaScript     

一、實現效果圖


二、分析布局

主盒子裡分上下兩個小盒子(1和2)。
包含圖片的盒子占兩張圖片的寬(3),處於上盒子中,當前圖片在上盒子(1)中,其它圖片在盒子(3)的右側等待播放。
下邊的盒子(2)包括了六個小方塊及定位在主盒子上的兩個箭頭。

三、html部分  

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>wangyi</title>
 <link type="text/css" rel="stylesheet" href="css/guide.css"/>
 <script type="text/javascript" src="../animate.js"></script>
 <script type="text/javascript" src="js/main.js"></script>
</head>
<body>
 <div class="w-slider">
  <div class="slider">
   <div class="slider-main" id="slider_main_block">
    <div class="slider-main-img"><a href="#"><img src="images/1.jpg"/></a></div>
    <div class="slider-main-img"><a href="#"><img src="images/2.jpg"/></a></div>
    <div class="slider-main-img"><a href="#"><img src="images/3.jpg"/></a></div>
    <div class="slider-main-img"><a href="#"><img src="images/4.jpg"/></a></div>
    <div class="slider-main-img"><a href="#"><img src="images/5.jpg"/></a></div>
    <div class="slider-main-img"><a href="#"><img src="images/6.jpg"/></a></div>

   </div>
  </div>
  <div class="slider-ctrl" id="slider_ctrl">
   <span class="slider-ctrl-pre"></span>
   <span class="slider-ctrl-next"></span>
  </div>
 </div>
</body>
</html>

四、CSS部分

* {
 margin: 0;
 padding: 0;
}
.w-slider {
 width:310px;
 height:265px;
 margin:100px auto;
 overflow: hidden;
 position: relative;
}
.slider {
 width:310px;
 height:220px;

}
.slider-main {
 width:620px;
 height:220px;
}
.slider-main-img{
 width:310px;
 height:220px;
 position:absolute;
 top:0;
 left:0;
}
.slider-main-img img{
 vertical-align: top;
}
.slider-ctrl {
 width:310px;
 height:45px;
 text-align:center;
}
.slider-ctrl span {
 cursor: pointer;
}
.slider-ctrl-con {
 display:inline-block;
 width:24px;
 height:20px;
 margin-right:8px;
 text-indent: -20em;
 overflow:hidden;
 background:url(../images/icon.png)-24px -782px no-repeat;
}
.slider-ctrl .current {
 background:url(../images/icon.png)-24px -762px no-repeat;
}
.slider-ctrl-pre,
.slider-ctrl-next {
 width:27px;
 height:38px;
 position:absolute;
 top:50%;
 margin-top:-36px;
 opacity:0.7;
 filter:alpha(opacity=50);
}
.slider-ctrl-pre {
 background:url(../images/icon.png)6px 1px no-repeat;
 left:0;
}
.slider-ctrl-next {
 background:url(../images/icon.png)-9px -44px no-repeat;
 right:0;
}

五、JS部

/**
 * Created by 15623544233 on 2016/10/17.
 */
window.onload=function () {
 //imgs的DOM對象
 var slider_main_block =$("slider_main_block");
 var sliderImgs =slider_main_block.children;
  //最外層的slider大盒子
 var sider_box =slider_main_block.parentNode.parentNode;
 //slider-ctrl的DOM對象
 var slider_ctrl = $("slider_ctrl");
 var sliderCtrls =slider_ctrl.children;
 //動態添加Ctrl
 for(var i=0;i<sliderImgs.length;i++){
  var spans = document.createElement("span");
  spans.className="slider-ctrl-con";
 //span中的數字為當前的索引,後面有重要作用
  spans.innerHTML =sliderImgs.length-i;
  slider_ctrl.insertBefore(spans,sliderCtrls[1]);
 }

 sliderCtrls[1].setAttribute("class","current slider-ctrl-con");
 //imgW ---圖片寬
 var imgW = sliderImgs[0].clientWidth;
 //讓除第一張圖以外的所有圖右移
 for(var i=1;i<sliderImgs.length;i++){
  sliderImgs[i].style.left=imgW+"px";
 }
//至關重要的標志位,currentId 當前出現的盒子   
  var currentId = 0;
 for(var key in sliderCtrls){
  sliderCtrls[key].onclick =function () {
   //左箭頭點擊的運動動畫 
   if(this.className=="slider-ctrl-pre"){
    //與左移動參數相反
    animate(sliderImgs[currentId],{left:imgW});
    --currentId<0?currentId=sliderImgs.length-1:currentId;
    sliderImgs[currentId].style.left=-imgW+"px";
    animate(sliderImgs[currentId],{left:0});
    //右箭頭的運動動畫,與自動輪播的運動動畫一致
   }else if(this.className=="slider-ctrl-next"){
    autoPlay();
   }else{
    //得到當前要點擊的圖片索引號
    var that = this.innerHTML-1;
    if(that>currentId){
     //像點擊右側按鈕一樣播放
     animate(sliderImgs[currentId],{left:-imgW});
     sliderImgs[that].style.left=imgW+"px";

    }else if(that<currentId){
     animate(sliderImgs[currentId],{left:imgW});
     sliderImgs[that].style.left=-imgW+"px";

    }
   /*當點擊按鈕後,當前圖片currentId移動後,所點擊的盒子成為當前的圖片,使圖片連續*/
    currentId =that;
    animate(sliderImgs[currentId],{left:0});

   }
   flashCurrent((currentId+1));
  };

 }
 //小方塊控制slider動畫的函數
 function flashCurrent(index) {
  //console.log(index);
  for(var i=1;i<sliderCtrls.length-1;i++){
   sliderCtrls[i].setAttribute("class","slider-ctrl-con");
  }
  sliderCtrls[index].setAttribute("class","current slider-ctrl-con");
 }
 //添加定時器
 var timer =null;
 timer =setInterval(autoPlay,2000);
 function autoPlay() {
  animate(sliderImgs[currentId],{left:-imgW});
  //當第6張左移走後,6>5,第0張回到框中
  ++currentId>sliderImgs.length-1?currentId = 0:currentId;
  //上一張圖片左移後,下一張圖片快速到右邊
  sliderImgs[currentId].style.left=imgW+"px";
  //下張右側圖片左移
  animate(sliderImgs[currentId],{left:0});
 }
 sider_box.onmouseover =function () {
  clearInterval(timer);
 }
 sider_box.onmouseout=function () {
  timer =setInterval(autoPlay,2000);
 }

};
function $(id) {
 return document.getElementById(id);
}
 /*當前樣式屬性值的獲取 */
function curStyle(obj,attr){
 if(obj.currentStyle){
//IE浏覽器 
 return obj.currentStyle[attr];
 }else{
 //標准浏覽器 
 return window.getComputedStyle(obj,null)[attr];
 }
}
 /*封裝的運動框架*/
/*obj ----做動畫的DOM對象 ;json----變化的部分是json數據 */      
function animate(obj,json) {
//調用時先清定時器   
 clearInterval(obj.timer);
//定時器為obj的內部定時器,不用每次調用都創建一個新的定時器    
 obj.timer = setInterval(function () {
//遍歷json數據,每次遍歷的標志位為flag    
  var flag=true;
//遍歷json數據,eg:{left:20,top:40,opacity:50,z-index:3}    
  for(var key in json){
   //取得盒子運動當前的位置
   var current= 0;
   if(key=="opacity"){
    //Ie6,7,8沒有設置透明度,默認為undefined
    current =Math.round(parseInt(curStyle(obj,key)*100))||1;
    //console.log(current);
   }else{
    current= parseInt(curStyle(obj,key));
   }

//運動步長:(目標位置-當前位置)/10
   var step = (json[key]-current)/10;
   step = step>0?Math.ceil(step):Math.floor(step);
//各屬性值的漸變動畫   
    if(key=="opacity"){
    if("opacity" in obj.style){
     obj.style.opacity = (current+step)/100;
    }else{
     //兼容ie6,7,8
     obj.style.filter ="alpha(opacity ="+(current+step)*10+")";
    }
   }else if(key=="zIndex"){
    obj.style[key] =json[key];
   }else
   {
    obj.style[key] = current+step+"px";
   }

//遍歷每個屬性時都判斷標志位
   if(current!=json[key]){
    flag =false;
   }
  }遍歷結束後,標志位都為true,判斷起所有動畫執行完畢,清除定時器
  if(flag){
   clearInterval(obj.timer);
  }
 },20)

}

以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持。

XML學習教程| jQuery入門知識| AJAX入門| Dreamweaver教程| Fireworks入門知識| SEO技巧| SEO優化集錦|
Copyright © DIV+CSS佈局教程網 All Rights Reserved