<div id="breedsdog"><h2 class="title">The Dog</h2><p class="describe">Split between cat,belong to the cat family,cat,cat,is the world's more widely<br>in the family pet.Cats ancestors is presumably desert cats</p><div class="breedsdog1"><div class="img"><img src="img2/labrador.jpg"/><a class="lookdog" href="#"></a></div><div class="img_txt"><p class="chinese">拉布拉多</p><p class="english">Labrador</p><p class="introduce">拉布拉多獵犬因原產地在加拿大的紐芬蘭與拉布拉多省而得名。拉布拉多犬是一種中大型犬類，個性忠誠、大氣、憨厚、溫和、陽光、開朗、活潑，智商極高，也對人很友善，是非常適合被選作經常出入公共場合的導盲犬或地鐵警犬及搜救犬和其他工作犬的狗品種，跟哈士奇（西伯利亞雪撬犬）和金毛獵犬并列三大無攻擊性犬類，拉布拉多智商位列世界犬類第七。</p></div></div></div>

//根據類名和父對象ID獲取屬性節點，解決getelementsByClass對瀏覽器的兼容性問題function getbyclass(classname,parent){    //傳入ID獲取父節點，如果該參數為空就為document var oParent=parent?document.getElementById(parent):document;    //定義一個空數組來存放屬性節點 var els=[];    //定義一個數組存放父對象的所有子節點 var elements=oParent.getElementsByTagName("*");    //遍歷所有子節點，根據類名把所有的子對象找出來，并且放在els數組內 for(var i=0;i<elements.length;i++){ if(elements[i].className==classname){ els.push(elements[i]); } } return els; }//根據對象要獲取的屬性名來得到屬性值function getStyle(obj,stylename){    //針對IE瀏覽器獲取樣式方法if(obj.currentStyle){return obj.currentStyle[stylename];    //針對其他瀏覽器獲取樣式方法}else if(getComputedStyle(obj,false)){return getComputedStyle(obj,false)[stylename];}}//緩沖動畫主函數，傳參類型：(對象，jaso格式要改變的樣式值(可多個)，緩沖系數，執行周期時間(值越小速度越快，越大越慢)，回調函數(是否有多次動畫的播放，可有可無))function MoveJason(obj,jason,average,cycle,continuefunction){clearInterval(obj.timer);obj.timer=setInterval(function(){for(var stylename in jason){//針對多效果的緩沖動畫// obj.style[stylename]=jason[stylename];// }if(stylename=="opacity"){var offvalue=Math.round(parseFloat(getStyle(obj,stylename))*100);var speed=(jason[stylename]-offvalue)/average;  speed=speed>0?Math.ceil(speed):Math.floor(speed);  if(speed==0){clearInterval(obj.timer);if(continuefunction) continuefunction();//回調函數，判斷是否有多次執行  }else{obj.style[stylename]=(offvalue+speed)/100;obj.style.filter="alpha(opacity:"+(offvalue+speed)+")";  }}else{var offvalue=parseInt(getStyle(obj,stylename));var speed=(jason[stylename]-offvalue)/average;  speed=speed>0?Math.ceil(speed):Math.floor(speed);  if(speed==0){clearInterval(obj.timer);if(continuefunction) continuefunction();  }else{obj.style[stylename]=offvalue+speed+"px";  }  }}},cycle);}

window.onload=function(){var imgdog=getbyclass("img","breedsdog");//在父對象breedsdog上找到所有的div.img    //給所有的div.img添加鼠標移入，鼠標移出事件for(var i=0;i<imgdog.length;i++){imgdog[i].onmouseover=function(){var obj=this.children[1];            MoveJason(obj,{"height":376,"width":206},5,30,function(){//緩沖動畫的函數調用，當執行完寬高值的緩沖變化，再回調函數執行透明度緩沖變化。以下同理，可以多層嵌套實現多個回調。        MoveJason(obj,{"opacity":30},5,30);    });}imgdog[i].onmouseout=function(){var obj=this.children[1];            MoveJason(obj,{"height":0,"width":0},5,30,function(){        MoveJason(obj,{"opacity":80},5,30);    });}}}