手机图片滑动切换，网上有很多这样的例子，但都借助于其他组件，让代码混乱的不行；还有就是用到css3里的 transform：translate（x,y）;移动元素,不过发现在不支持css3的设备上马上完蛋了，所以下定决心自己做一个，谁知出现了很多的问题，其中最重要的是给图片加链接，网页中的上下滚动条不能在拖动图片的时候滚动，并且不能兼容pc机器上的拖动；在这里就简单介绍一下遇到的问题和解决的方法；
问题一：给图片加上链接后，在拖动的时候总是跳到其他页面
问题根源主要是不能判断是点击还是拖动，手机事件一般顺序是 touchstart-》mousedown-》mousemove-》touchmove-》mouseup-》touchend-》click，根据不同手机可能会有不同。触屏手机的事件一般都用 touchstart -》 touchmove -》 touchend -》 click，click事件是最后执行的，当我们有touchstart，touchmove，touchend处理完后，如果不进行return或取消默认就会触发click事件，这样网页就跳走了，解决办法是记录touchstart的坐标点和touchmove的坐标点，根据两个坐标点算出触点是否移动过，其中值得关注的是事件的Event参数，触屏一般是 event.touches，event.targetTouches，event.changedTouches。我在测试当中发现者三个参数的值时一样的，不过值得注意的是touchend事件不会得到触点坐标（也或许是设备问题），在移动的时候touchmove会不断出发，有时候touchmove会不触发，其中就是浏览器自带一下功能把触点（或鼠标）脱离了选中的元素，比如上时间按住会出现菜单，（pc上图片就会生成一个可以拖动的缩略图），这样就要在touchstart（mousedown）的时候先 event.preventDefault();取消默认。
问题二：网页中的上下滚动条不能在拖动图片的时候滚动
相信这个问题只要制作过得都会遇到，其实主要是在移动（touchmove，mousemove）的时候取消了默认事件event.preventDefault(),在这里我们需要做的是，是否移动获得触点和开始的触点是否一致，如果一致就直接返回，还要算出是移动的x轴多一点还是y轴移动的多一点，这样我们就可以做左右滑动的时候取消默认，在上学的时候不取消；
问题三： 并且不能兼容pc机器上的拖动
这是因为在绑定事件的时候不能完全考虑事件名称是touchstart还是mousedown ，从网上搜了一下，感觉做的不做，就直接抄过来了
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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); |
大概是这个意思，根据设备不同绑定不同的事件
其实还碰到了很多的问题，就不一一说明了
不多说了，直接把代码贴出来了，如果有什么不太好的地方，还请多多包含和提出意见
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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 = 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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 ? 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> |
用法：
在页面加载完成后
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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) |
如果一个也没需要多个图片切换效果可以再代码中查找 var loaded=function()
在其中定义您需要个切换图片个数，并定出名字
如
w.WapImage=new WapImage();
w.WapImages=new WapImage();
在页面加载完后就可以直接调用
WapImage.start()和WapImages.start()
