window.onload = function(){//輪播初始化var lunbo = document.getElementById('content');var imgs = lunbo.getElementsByTagName('img'); var uls = lunbo.getElementsByTagName('ul');var lis = lunbo.getElementsByTagName('li');var next = document.getElementById('next');var prev = document.getElementById('prev');var item = 0;//初始狀態下，一個圓圈為高亮模式lis[0].style.fontSize = '26px';lis[0].style.color = '#fff';imgs[0].style.display = 'block';//定義一個全局變量，用來進行自動輪播圖片順序的變化var pic_index = 1;//自動輪播.使用pic_time記錄播放，可以隨時使用clearInterval()清除掉。var pic_time = setInterval(autobofang,1000);//自動播放的事件處理function autobofang(){if(pic_index >= lis.length){pic_index = 0;}picChange(pic_index);pic_index++;}//手動輪播for(var i=0;i<lis.length;i++){ lis[i].addEventListener("mouseover",change,false);}function change(event){ var event=event||window.event;var target=event.target||event.srcElement; var children = target.parentNode.children; for(var i=0;i<children.length;i++){if(target == children[i]){ picChange(i); } }} //圖片切換函數function picChange(i){ //讓所有圖片都不顯示，所有圓圈都為普通樣式 for(var j=0;j<imgs.length;j++){ imgs[j].style.display = 'none'; lis[j].style.fontSize = '24px';lis[j].style.color = '#999';}//讓選中的索引的圖片顯示，對應的圓圈高亮 imgs[i].style.display = 'block'; lis[i].style.fontSize = '26px';lis[i].style.color = '#fff'; }//當鼠標移近圖片區域內，自動播放停止lunbo.addEventListener("mouseover",function(){clearInterval(pic_time);},false);//當鼠標移出圖片區域內，自動播放繼續lunbo.addEventListener("mouseout",function(){pic_time = setInterval(autobofang,1000); },false);//后退箭頭點擊事件，圖片會跟著點擊事件不斷變化 next.addEventListener("click",movenext,false);function movenext(){if(item == 2){item=0;}else{item+=1;}picChange(item);}prev.addEventListener("click",moveprev,false);function moveprev(){if(item == 0){item=2;}else{item-=1;} picChange(item);}}