wap手機圖片滑動切換特效無css3元素js腳本編寫

2019-11-20 14:19:24

字體：大中小

來源：轉載

供稿：網友

手機圖片滑動切換，網上有很多這樣的例子，但都借助于其他組件，讓代碼混亂的不行；還有就是用到css3里的 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，所有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，并且不能兼容pc機器上的拖動；在這里就簡單介紹一下遇到的問題和解決的方法；

問題一：給圖片加上鏈接后，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事件是最后執行的，當我們有touchstart，touchmove，touchend處理完后，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，其中就是瀏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(),在這里我們需要做的是，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：并且不能兼容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，如果有什么不太好的地方，還請多多包含和提出意見

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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：

在頁面加載完成后

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，即到最后一張是否直接轉入第一張，或到第一張直接轉入最后一張leftOrright:'left',//像左側自動切換還是像右側自動切換callBack:function(obj){//切換成功后回調函數 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，并定出名字

如

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

在頁面加載完后就可以直接調用

WapImage.start()和WapImages.start()

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