wap picture scrolling special effects without css3 elements pure js script writing

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wap picture scrolling special effects without css3 elements pure js script writing_javascript skills

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May 16, 2016 pm 04:39 PM

css3 js Picture scroll

Sliding switching of mobile phone images. There are many such examples on the Internet, but they all rely on other components, which makes the code confusing. There is also the use of transform in CSS3: translate (x, y); to move elements, but I found that It was almost over on devices that did not support CSS3, so I decided to make one myself. Unexpectedly, there were many problems, the most important of which was adding links to images. The up and down scroll bars in the web page could not scroll when dragging the image. , and is not compatible with dragging on PC machines; here I will briefly introduce the problems encountered and solutions;

Problem 1: After adding a link to an image, it always jumps to other pages when dragging it

The main source of the problem is that it cannot determine whether it is click or drag. The general order of mobile phone events is touchstart-》mousedown-》mousemove-》touchmove-》mouseup-》touchend-》click, which may be different depending on different mobile phones. Events on touch screen mobile phones generally use touchstart -> touchmove -> touchend -> click. The click event is executed last. When we have touchstart, touchmove, and touchend processed, if we do not return or cancel the default, the click event will be triggered. , so the web page jumps away. The solution is to record the coordinate point of touchstart and the coordinate point of touchmove, and calculate whether the touch point has moved based on the two coordinate points. What is worth paying attention to is the Event parameter of the event. Touch screen is generally event. touches, event.targetTouches, event.changedTouches. During the test, I found that the values of the three parameters are the same. However, it is worth noting that the touchend event will not get the touch point coordinates (it may be a device problem). Touchmove will continue to start when moving. Sometimes touchmove will not Trigger, which means that the browser has a built-in function to detach the touch point (or mouse) from the selected element. For example, if you press and hold for a long time, a menu will appear (the picture on the PC will generate a thumbnail that can be dragged), so that To cancel the default, event.preventDefault(); must be used when touchingstart (mousedown).

Problem 2: The up and down scroll bars on the web page cannot scroll when dragging the image

I believe that this problem will be encountered as long as you make it. In fact, it is mainly because the default event event.preventDefault() is canceled when moving (touchmove, mousemove). What we need to do here is whether to move to obtain the touch point and Whether the starting contact points are consistent, if they are consistent, return directly, and also calculate whether the x-axis moves more or the y-axis moves more, so that we can cancel the default when sliding left and right, and not cancel when going to school;

Problem 3: And it is not compatible with dragging on PC machines

This is because when binding the event, you cannot completely consider whether the event name is touchstart or mousedown. I searched it on the Internet and felt that it was not done, so I copied it directly

this.eventName={
touchstart:'touchstart',
touchmove:'touchmove',
touchend:'touchend',
}
在做判断
if(!device){
this.eventName.touchstart='mousedown';
this.eventName.touchmove='mousemove';
this.eventName.touchend='mouseup';
}
dom.addEventListener(this.eventName.touchstart,handleEvent,false);

Copy after login

This is probably what it means, different events are bound according to different devices

In fact, I encountered a lot of problems, so I won’t explain them one by one

No more words, just posted the code. If there is anything that is not good, please include it and make comments

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" />
<meta content="yes" name="apple-mobile-web-app-capable" />
<meta content="black" name="apple-mobile-web-app-status-bar-style" />
<meta content="telephone=no" name="format-detection" />
<title></title>
<style type="text/css">

html,body,*{ margin: 0; padding: 0; border: 0;}
#wapListImage1, #wapListImage{width: 100%; overflow: hidden; height: auto; cursor: move; zoom:1; position: relative;}
#wapListImage1 ul,
#wapListImage1 ul li,
#wapListImage1 ul,
#wapListImage ul li{ list-style: none;}
#wapListImage1 ul, #wapListImage ul{width: 99999px;}
#wapListImage1 ul li, #wapListImage ul li{ float: left;}
#wapListImage ul li a img:focus,
#wapListImage ul li a img:checked,
#wapListImage ul li a img,
#wapListImage ul li a img:active,
#wapListImage ul li a,#wapListImage ul li a:active{cursor: move;}
#wapListImage dl{ position: absolute; bottom: 10px; right: 0;}
#wapListImage dl span{overflow: hidden;width: 10px; height: 10px; background-color: #900; display: inline-block;}
#wapListImage dl span.selected{ background-color: #000;}
</style>
</head>
<body>
<div id="k">
<div id="wapListImage">
<ul>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd" target="_black"><img src="http://file25.mafengwo.net/M00/37/74/wKgB4lM9Hb-ARjpJAAOsX46Kq9w39.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/F2/06/wKgB4lNaHHCASXmDAAFtZsUxuwQ66.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/2B/EE/wKgB4lNwdpeAbvZiAAWcFRXe2Po83.gonglve.w690.jpeg"></a></li>
<!-- <li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd" target="_black"><img src="http://file25.mafengwo.net/M00/37/74/wKgB4lM9Hb-ARjpJAAOsX46Kq9w39.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/F2/06/wKgB4lNaHHCASXmDAAFtZsUxuwQ66.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/2B/EE/wKgB4lNwdpeAbvZiAAWcFRXe2Po83.gonglve.w690.jpeg"></a></li> -->
</ul>
<dl>
<span class="selected">1</span>
<span>2</span>
<span>3</span>
<!-- <span>4</span>
<span>5</span>
<span>6</span> -->

</dl>
</div>
</div>
<div style="height:200px;"></div>
<div id="wapListImage1">
<ul>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd" target="_black"><img src="http://file25.mafengwo.net/M00/37/74/wKgB4lM9Hb-ARjpJAAOsX46Kq9w39.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/F2/06/wKgB4lNaHHCASXmDAAFtZsUxuwQ66.gonglve.w690.jpeg"></a></li>
<li><a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" hrefto="ddd"><img src="http://file25.mafengwo.net/M00/2B/EE/wKgB4lNwdpeAbvZiAAWcFRXe2Po83.gonglve.w690.jpeg"></a></li>
</ul>
</div>
<script type="text/javascript">
;(function(w,d){
var device = (/android|webos|iphone|ipad|ipod|blackberry|iemobile|opera mini/i.test(navigator.userAgent.toLowerCase()));
function WapImage(){
this.options={
dom: null,
speed:200,
isupdate:true,
time:3000,
leftOrright:'left',
isfor:false,
callBack:function(){}
},
this.eventName={
touchstart:'touchstart',
touchmove:'touchmove',
touchend:'touchend',
},
this.point={
x:5,
y:5,
pageX1:0,
pageX2:0,
pageY1:0,
pageY2:0
},
this.page={
bodyWidth:320,
domUL:null,
liList:null,
index: 0,
flag:false,
sTime:0,
eTime:0,
isDown:false,
mleft:0,
back:30,
moveId:[],
nextId:null,
prevId:null,
isdom:false
},
this.Event={
handleEvent: function(event,lib){
event = event &#63; event : window.event;
// console.log(event.type)
switch(event.type){

case "touchstart":
var touch = event.touches[0];
case "mousedown":
if(lib.page.isDown) return;
lib.page.isDown=true;
lib.page.sTime=lib.page.eTime=new Date().getTime();
lib.Event.stop(lib,lib);
if(event.type=="mousedown"){
touch = event;
event.preventDefault();
}
lib.point.pageX1 = lib.point.pageX2 = touch.pageX;
lib.point.pageY1 = lib.point.pageY2 = touch.pageY;
lib.page.mleft = parseFloat(lib.page.domUL.style.marginLeft);
lib.page.mleft = lib.page.mleft &#63; lib.page.mleft : 0;
break;
case "touchmove":
var touch = event.touches[0];
case "mousemove":
if(!lib.page.isDown) return;

if(event.type=="mousemove"){
touch = event;
}
lib.point.pageX2 = touch.pageX;
lib.point.pageY2 = touch.pageY;


if(lib.point.pageX1==lib.point.pageX2){
event.preventDefault(); 
return false;
}
var changeX = lib.point.pageX1 - lib.point.pageX2;
var changeY = lib.point.pageY1 - lib.point.pageY2;
if(Math.abs(changeX)>Math.abs(changeY)) {//左右事件
event.preventDefault(); 
lib.page.domUL.style.marginLeft=lib.page.mleft-changeX+'px';
if(parseFloat(lib.page.domUL.style.marginLeft)<= -(lib.page.liList.length-1)*lib.page.bodyWidth){
lib.page.domUL.style.marginLeft= -(lib.page.liList.length-1)*lib.page.bodyWidth+'px';
lib.page.mleft=-(lib.page.liList.length-1)*lib.page.bodyWidth;
}
if(parseFloat(lib.page.domUL.style.marginLeft)>0){
lib.page.domUL.style.marginLeft='0px';
lib.page.mleft=0;
}


}else if(Math.abs(changeY)>Math.abs(changeX)){//上下事件

}else{//长按或点击

}
break;
case "mouseup":
case "touchend":
if(!lib.page.isDown) return;
lib.page.eTime=new Date().getTime();
lib.page.mleft = parseFloat(lib.page.domUL.style.marginLeft);
lib.page.mleft = lib.page.mleft &#63; lib.page.mleft : 0;

var changeX = lib.point.pageX1 - lib.point.pageX2;
var changeY = lib.point.pageY1 - lib.point.pageY2;
if(Math.abs(changeX)>Math.abs(changeY)) {//左右事件

event.preventDefault();
lib.Event.move.call(this,lib);

}else if(Math.abs(changeY)>Math.abs(changeX)){//上下事件
lib.Event.move.call(this,lib);
}else{//长按或点击
if((lib.page.eTime - lib.page.sTime) > 300) {//长按
}else{//点击
if(event.button==0 || event.type=='touchend'){
var a = lib.page.liList[lib.page.index].getElementsByTagName('a')[0];
if(typeof a.getAttribute('target')=='object'){
w.location=a.getAttribute('hrefto')
}else{
w.open(a.getAttribute('hrefto'));
}
}

}
}
lib.page.isDown=false;
break;
default:
break;
}
},
position: function(lib,index){
// if(index==undefined){
// lib.page.domUL.style.marginLeft= -(lib.page.index*lib.page.bodyWidth) +'px';
// }else{
// lib.page.domUL.style.marginLeft= -(index*lib.page.bodyWidth) +'px';
// lib.page.index=index;
// }



if(!lib.options.isfor){
if(index==undefined){
lib.page.domUL.style.marginLeft= -(lib.page.index*lib.page.bodyWidth) +'px';
}else{
lib.page.domUL.style.marginLeft= -((index-1)*lib.page.bodyWidth) +'px';
lib.page.index=index-1;
}
lib.options.callBack({"index":parseInt(lib.page.liList[lib.page.index].getAttribute('index'))+1});
}else{
if(index==undefined){
lib.page.domUL.style.marginLeft= -lib.page.bodyWidth +'px';
}else{
lib.page.domUL.style.marginLeft= -lib.page.bodyWidth +'px';
while(true){
if(parseInt(index)==parseInt(lib.page.liList[1].getAttribute('index'))+1){
break;
}
lib.page.domUL.insertBefore(lib.page.liList[lib.page.liList.length-1],lib.page.liList[0]);
}
}
lib.options.callBack({"index":parseInt(lib.page.liList[1].getAttribute('index'))+1});
}
},
stop:function(lib){
for(var i =0;i<lib.page.moveId.length;i++){
clearInterval(lib.page.moveId[i]);
}
lib.page.moveId=[];
},
start:function(lib){
if(lib.options.isupdate){
lib.page.moveId[lib.page.moveId.length] = setInterval(function(){
if(lib.options.leftOrright=='left'){
lib.Event.next(lib,lib);
}else{
lib.Event.prev(lib,lib);
}
},lib.options.time);
}
},
next:function(lib){
// console.log(lib.page.prevId.length+"nextId")
// for (var n=0;n<lib.page.prevId.length;n++) {
// // clearInterval(lib.page.prevId[n]);
// };
// lib.page.prevId=[];
clearInterval(lib.page.prevId);
lib.page.prevId=null;
// var left = (lib.page.bodyWidth-Math.abs(lib.point.pageX1-lib.point.pageX2))/lib.options.speed;
var yu = Math.abs(parseInt(lib.page.domUL.style.marginLeft));
while(true){
if(yu==0){
yu=lib.page.bodyWidth;
break;
}else if(yu<0){
yu= Math.abs(yu);
break;
}
yu=yu-lib.page.bodyWidth
}
// var left = (lib.page.bodyWidth-Math.abs(parseFloat(lib.page.domUL.style.marginLeft)%lib.page.bodyWidth))/lib.options.speed;
var left = yu/lib.options.speed;
var c = 0;
if(lib.page.index==lib.page.liList.length-1){
lib.page.flag=false;
return;
}
clearInterval(lib.page.nextId);
lib.page.nextId = window.setInterval(function(){
// lib.Event.stop(lib,lib);
// if(lib.page.moveId==null){
// clearInterval(id);
// }
c=c+5;
lib.page.domUL.style.marginLeft= (parseFloat(lib.page.domUL.style.marginLeft)-left*5)+'px';
// console.log("next"+lib.page.domUL.style.marginLeft);
if(c>=lib.options.speed || parseFloat(lib.page.domUL.style.marginLeft)<= -(lib.page.liList.length-1)*lib.page.bodyWidth ){
if(parseFloat(lib.page.domUL.style.marginLeft)<= -(lib.page.liList.length-1)*lib.page.bodyWidth){
lib.page.domUL.style.marginLeft= -(lib.page.liList.length-1)*lib.page.bodyWidth+'px';
}
clearInterval(lib.page.nextId);
// for(var n=0;n=lib.page.nextId.length;n++){
// clearInterval(lib.page.nextId[0]);
// }
// lib.page.nextId=[];
lib.page.index++;
lib.page.flag=false;
lib.Event.domUpdate.call(this,lib,'r');
if(lib.page.moveId.length==0){
lib.Event.start(lib,lib);
}

}
},5);
},
prev:function(lib){
// console.log(lib.page.nextId.length+"nextId")
// for(var n=0;n=lib.page.nextId.length;n++){
// // clearInterval(lib.page.nextId[0]);
// }
clearInterval(lib.page.nextId);
lib.page.nextId=null;
// lib.page.nextId=[];
// var left = (lib.page.bodyWidth-Math.abs(lib.point.pageX1-lib.point.pageX2))/lib.options.speed;
// var left = (lib.page.bodyWidth-Math.abs(parseFloat(lib.page.domUL.style.marginLeft)%lib.page.bodyWidth))/lib.options.speed;
var yu = Math.abs(parseInt(lib.page.domUL.style.marginLeft));
// console.log(yu+"----"+lib.page.domUL.style.marginLeft)
while(true){
if(yu==0){
yu=lib.page.bodyWidth;
break;
}else if(yu<0){
yu= lib.page.bodyWidth-Math.abs(yu);
break;
}
yu=yu-lib.page.bodyWidth
}
// var left = (lib.page.bodyWidth-yu)/lib.options.speed;
var left = yu/lib.options.speed;
var c = 0,id;
if(lib.page.index==0){
lib.page.flag=false;
return;
} 
var ml = parseFloat(lib.page.domUL.style.marginLeft);
clearInterval(lib.page.prevId);
lib.page.prevId = window.setInterval(function(){
c=c+5;
lib.page.domUL.style.marginLeft= (parseFloat(lib.page.domUL.style.marginLeft)+left*5)+'px';
// console.log(lib.page.domUL.style.marginLeft);
if(c>=lib.options.speed || parseFloat(lib.page.domUL.style.marginLeft)>=0){
if(parseFloat(lib.page.domUL.style.marginLeft)>=0){
lib.page.domUL.style.marginLeft='0px';
}

clearInterval(lib.page.prevId);
// for (var n=0;n<lib.page.prevId.length;n++) {
// clearInterval(lib.page.prevId[n]);
// };
// lib.page.prevId=[];

lib.page.index--;
lib.page.flag=false;
lib.Event.domUpdate.call(this,lib,'l');
if(lib.page.moveId.length==0){
lib.Event.start(lib,lib);
}
}
},5);
},
move:function(lib){
if(lib.page.flag) return;
lib.page.flag=true;
if(Math.abs(lib.point.pageX1-lib.point.pageX2)<lib.page.back){
var h = Math.abs(Math.abs(parseFloat(lib.page.domUL.style.marginLeft))-Math.abs(lib.page.bodyWidth*lib.page.index))
h = h/70;

var hi = 0;
var hid;
hid = window.setInterval(function(){

if(lib.point.pageX2>lib.point.pageX1){
lib.page.domUL.style.marginLeft = (parseFloat(lib.page.domUL.style.marginLeft) - h*5) +'px';
}else{

lib.page.domUL.style.marginLeft = (parseFloat(lib.page.domUL.style.marginLeft) + h*5) + 'px';
}
hi=hi+5;
if(hi>=70){
clearInterval(hid);
lib.page.domUL.style.marginLeft= -(lib.page.index*lib.page.bodyWidth) +'px';
lib.page.flag=false;
}
},5);
return;
}


if(lib.point.pageX1-lib.point.pageX2>0){
lib.Event.next.call(this,lib);
}else if(lib.point.pageX2-lib.point.pageX1>0){
// console.log("===")
lib.Event.prev.call(this,lib);
}
},
domUpdate: function(lib,type){
if(lib.page.isdom) return;
lib.page.isdom=true;

if(!lib.options.isfor){
var index = lib.page.liList[lib.page.index].getAttribute('index');
lib.options.callBack({"index":parseInt(index)+1});
lib.page.isdom=false;
return;
}
if(type=='l'){
lib.page.domUL.insertBefore(lib.page.liList[lib.page.liList.length-1],lib.page.liList[0]);
lib.page.domUL.style.marginLeft=-lib.page.bodyWidth+'px';//(parseFloat(lib.page.domUL.style.marginLeft)-lib.page.bodyWidth)+'px';
//lib.page.index++;
}else if(type=='r'){
lib.page.domUL.appendChild(lib.page.liList[0]);
lib.page.domUL.style.marginLeft=-lib.page.bodyWidth+'px';//(parseFloat(lib.page.domUL.style.marginLeft)+lib.page.bodyWidth)+'px';
//lib.page.index--;
}
lib.page.index=1;
// console.log(lib.page.index)
var index = lib.page.liList[lib.page.index].getAttribute('index');
lib.options.callBack({"index":parseInt(index)+1});
lib.page.isdom=false;
}
};
};
WapImage.prototype = {
setoption: function(arg){
for(var i in this.options){
this.options[i]= arg[i] !== undefined &#63; arg[i] : this.options[i];
}
if(!device){
this.eventName.touchstart='mousedown';
this.eventName.touchmove='mousemove';
this.eventName.touchend='mouseup';
}
//return temp;
},
bindEvent: function(){
var lib = this;
this.page.domUL.addEventListener(this.eventName.touchstart,function(event){lib.Event.handleEvent.call(lib,event,lib);},false);
w.addEventListener(this.eventName.touchmove,function(event){lib.Event.handleEvent.call(lib,event,lib);},false);
w.addEventListener(this.eventName.touchend,function(event){lib.Event.handleEvent.call(lib,event,lib);},false);
w.addEventListener('resize',function(){lib.init();},false);
},
init:function(){
this.page.bodyWidth=document.body.clientWidth;
this.page.liList= this.options.dom.getElementsByTagName('li');
this.page.domUL = this.options.dom.getElementsByTagName('ul')[0];
this.options.dom.style.width=this.page.bodyWidth+'px';

for(var i=0;i<this.page.liList.length;i++){
var item = this.page.liList[i];
var img = item.getElementsByTagName('img')[0];
item.setAttribute('index',i);
item.style.width=this.page.bodyWidth+'px';
img.style.width = this.page.bodyWidth+'px';
}
if(this.page.liList.length<3){
var length = this.page.liList.length;
if(length==1){
this.page.domUL.appendChild(this.page.liList[0].cloneNode(true));
this.page.domUL.appendChild(this.page.liList[0].cloneNode(true));
}else{
for(var i=0;i<length;i++){
this.page.domUL.appendChild(this.page.liList[i].cloneNode(true));
}
}

this.page.liList= this.options.dom.getElementsByTagName('li'); 
}
},
position:function(index){
this.Event.position.call(this,this,index);
},
next:function(){
this.Event.next.call(this,this);
},
prev:function(){
this.Event.prev.call(this,this);
},
start: function(arg){
this.setoption(arg);
this.init();
this.position();
this.bindEvent();
this.Event.domUpdate(this,'l');
this.Event.start(this);

}
};
var loaded=function(){
w.WapImage=new WapImage();
w.WapImages=new WapImage();
};
(function(){
if(d.body){
loaded();
}else{
if(d.addEventListener){
d.addEventListener( 'DOMContentLoaded', function(){
d.removeEventListener( 'DOMContentLoaded', arguments.callee, false );
loaded();
}, false );
}else if(d.attachEvent){
d.attachEvent( 'onreadystatechange', function(){
if( d.readyState === 'complete' ){
d.detachEvent( 'onreadystatechange', arguments.callee );
loaded();
}
});
}
}
})();
})(window,document,undefined);

window.onload = function(){
var obj = {
dom:document.getElementById('wapListImage'),
isupdate:true,
time:3000,
isfor:true,
leftOrright:'left',
callBack:function(obj){
var span = document.getElementById('wapListImage').getElementsByTagName('dl')[0].getElementsByTagName('span');
for(var k = 0;k<span.length;k++){
span[k].className='';
}
span[obj.index-1].className='selected'
// console.log(obj.index)
}
};
WapImage.start(obj);
WapImage.position(2)
var obj2 = {
dom:document.getElementById('wapListImage1'),
callBack:function(obj){
// console.log(obj.index)
}
};
WapImages.start(obj2);
// var img = new w.WapImage();
// img.start(obj);
}
</script>
</body>
</html>

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Usage:

After the page is loaded

var obj = {
dom:document.getElementById('wapListImage'),//dom元素
isupdate:true,//是否自动切换
time:3000,//自动切换的时间毫秒
isfor:true, //是否循环播放，即到最后一张是否直接转入第一张，或到第一张直接转入最后一张
leftOrright:'left',//像左侧自动切换还是像右侧自动切换
callBack:function(obj){//切换成功后回调函数 其实有index参数为当前第几张图片

//自己处理
var span = document.getElementById('wapListImage').getElementsByTagName('dl')[0].getElementsByTagName('span');
for(var k = 0;k<span.length;k++){
span[k].className='';
}
span[obj.index-1].className='selected'
// console.log(obj.index)
}
};
WapImage.start(obj);
WapImage.position(2)

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If you don’t need multiple image switching effects, you can find var loaded=function()

in the code

Define the number of switching pictures you need and name them

w.WapImage=new WapImage();
w.WapImages=new WapImage();

You can call it directly after the page is loaded

WapImage.start() and WapImages.start()

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