手機圖片滑動切換，網上有很多這樣的例子，但都借助於其他組件，讓代碼混亂的不行；還有就是用到css3裡的 transform：translate（x,y）;移動元素,不過發現在不支持css3的設備上馬上完蛋了，所以下定決心自己做一個，誰知出現了很多的問題，其中最重要的是給圖片加鏈接，網頁中的上下滾動條不能在拖動圖片的時候滾動，並且不能兼容pc機器上的拖動；在這裡就簡單介紹一下遇到的問題和解決的方法；
問題一：給圖片加上鏈接後，在拖動的時候總是跳到其他頁面
問題根源主要是不能判斷是點擊還是拖動，手機事件一般順序是 touchstart-》mousedown-》mousemove-》touchmove-》mouseup-》touchend-》click，根據不同手機可能會有不同。觸屏手機的事件一般都用 touchstart -》 touchmove -》 touchend -》 click，click事件是最後執行的，當我們有touchstart，touchmove，touchend處理完後，如果不進行return或取消默認就會觸發click事件，這樣網頁就跳走了，解決辦法是記錄touchstart的坐標點和touchmove的坐標點，根據兩個坐標點算出觸點是否移動過，其中值得關注的是事件的Event參數，觸屏一般是 event.touches，event.targetTouches，event.changedTouches。我在測試當中發現者三個參數的值時一樣的，不過值得注意的是touchend事件不會得到觸點坐標（也或許是設備問題），在移動的時候touchmove會不斷出發，有時候touchmove會不觸發，其中就是浏覽器自帶一下功能把觸點（或鼠標）脫離了選中的元素，比如上時間按住會出現菜單，（pc上圖片就會生成一個可以拖動的縮略圖），這樣就要在touchstart（mousedown）的時候先 event.preventDefault();取消默認。
問題二：網頁中的上下滾動條不能在拖動圖片的時候滾動
相信這個問題只要制作過得都會遇到，其實主要是在移動（touchmove，mousemove）的時候取消了默認事件event.preventDefault(),在這裡我們需要做的是，是否移動獲得觸點和開始的觸點是否一致，如果一致就直接返回，還要算出是移動的x軸多一點還是y軸移動的多一點，這樣我們就可以做左右滑動的時候取消默認，在上學的時候不取消；
問題三： 並且不能兼容pc機器上的拖動
這是因為在綁定事件的時候不能完全考慮事件名稱是touchstart還是mousedown ，從網上搜了一下，感覺做的不做，就直接抄過來了
this.eventName={
touchstart:'touchstart',
touchmove:'touchmove',
touchend:'touchend',
}
在做判斷
if(!device){
this.eventName.touchstart='mousedown';
this.eventName.touchmove='mousemove';
this.eventName.touchend='mouseup';
}
dom.addEventListener(this.eventName.touchstart,handleEvent,false);
大概是這個意思，根據設備不同綁定不同的事件
其實還碰到了很多的問題，就不一一說明了
不多說了，直接把代碼貼出來了，如果有什麼不太好的地方，還請多多包含和提出意見
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}
if(!device){
this.eventName.touchstart='mousedown';
this.eventName.touchmove='mousemove';
this.eventName.touchend='mouseup';
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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);
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var img = item.getElementsByTagName('img')[0];
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img.style.width = this.page.bodyWidth+'px';
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this.page.domUL.appendChild(this.page.liList[0].cloneNode(true));
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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：
在頁面加載完成後
var obj = {
dom:document.getElementById('wapListImage'),//dom元素
isupdate:true,//是否自動切換
time:3000,//自動切換的時間毫秒
isfor:true, //是否循環播放，即到最後一張是否直接轉入第一張，或到第一張直接轉入最後一張
leftOrright:'left',//像左側自動切換還是像右側自動切換
callBack:function(obj){//切換成功後回調函數 其實有index參數為當前第幾張圖片
//自己處理
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)
如果一個也沒需要多個圖片切換效果可以再代碼中查找 var loaded=function()
在其中定義您需要個切換圖片個數，並定出名字
如
w.WapImage=new WapImage();
w.WapImages=new WapImage();
在頁面加載完後就可以直接調用
WapImage.start()和WapImages.start()