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//产品详细页右侧图片切换js (function(){ function G(s){ return document.getElementById(s); } function getStyle(obj, attr){ if(obj.currentStyle){ return obj.currentStyle[attr]; }else{ return getComputedStyle(obj, false)[attr]; } } function Animate(obj, json){ if(obj.timer){ clearInterval(obj.timer); } obj.timer = setInterval(function(){ for(var attr in json){ var iCur = parseInt(getStyle(obj, attr)); iCur = iCur ? iCur : 0; var iSpeed = (json[attr] - iCur) / 5; iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed); obj.style[attr] = iCur + iSpeed + 'px'; if(iCur == json[attr]){ clearInterval(obj.timer); } } }, 30); } var oPic = G("picBox"); var oList = G("listBox"); var oPrev = G("prev"); var oNext = G("next"); var oPrevTop = G("prevTop"); var oNextTop = G("nextTop"); var oPicLi = oPic.getElementsByTagName("li"); var oListLi = oList.getElementsByTagName("li"); var len1 = oPicLi.length; var len2 = oListLi.length; var oPicUl = oPic.getElementsByTagName("ul")[0]; var oListUl = oList.getElementsByTagName("ul")[0]; var w1 = oPicLi[0].offsetWidth; var w2 = oListLi[0].offsetWidth; oPicUl.style.width = w1 * len1 + "px"; oListUl.style.width = w2 * len2 + "px"; var index = 0; var num = 5; var num2 = Math.ceil(num / 2); function Change(){ Animate(oPicUl, {left: - index * w1}); if(index < num2){ Animate(oListUl, {left: 0}); }else if(index + num2 <= len2){ Animate(oListUl, {left: - (index - num2 + 1) * w2}); }else{ Animate(oListUl, {left: - (len2 - num) * w2}); } for (var i = 0; i < len2; i++) { oListLi[i].className = ""; if(i == index){ oListLi[i].className = "on"; } } } oNextTop.onclick = oNext.onclick = function(){ index ++; index = index == len2 ? 0 : index; Change(); } oPrevTop.onclick = oPrev.onclick = function(){ index --; index = index == -1 ? len2 -1 : index; Change(); } for (var i = 0; i < len2; i++) { oListLi[i].index = i; oListLi[i].onclick = function(){ index = this.index; Change(); } } })();
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