本文實例講述了JS實現從頂部下拉顯示的帶動畫QQ客服特效代碼。分享給大家供大家參考，具體如下：
這是一款動畫版QQ在線客服代碼，從網頁頂部下拉出來的QQ客服，下滑結束后有彈性緩沖效果。在世界地圖的映襯下，似乎一下子上升了品位。動畫效果是由jq實現的，QQ客服的一些信息自己修改下，換成你自己的QQ，上傳到網頁就可用啦。注：在火狐臺chrome瀏覽器中測試效果會更好。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-top-show-down-dh-qq-online-codes/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>網頁頂部下拉的jquery在線客服</title><style>*{margin: 0px;padding: 0px;list-style: none;}#qqlist a{text-decoration: none;color: black;font-size: 12px;display: block;line-height: 28px;vertical-align: middle;}img{line-height: 28px;vertical-align: middle;text-align: center;padding-bottom: 6px;}#cs{width: 100%;height: 0px;border-bottom: 3px solid red;-webkit-box-shadow: 2px 2px 2px #999;position: relative;top: 0px;-moz-box-shadow: 2px 2px 2px #999;box-shadow: 2px 2px 2px #999;}#qqlist{position: absolute;left: -200px;top: 150px;z-index: 1;}#qqlist ul li{width: 80px;height: 28px;margin: 10px;}#bg{width: 918px;height: 500px;position: absolute;right: 10px;display: none;filter: alpha(opacity: 0);opacity: 0;}#btn{width: 100px;height: 20px;margin: auto;background: red;-webkit-box-shadow: 2px 2px 2px #999;border-radius: 0 0 8px 8px;position: relative;top: 0px;-moz-box-shadow: 2px 2px 2px #999;box-shadow: 2px 2px 2px #999;}#btn span{display: block;color: white;text-align: center;line-height: 20px;cursor: pointer;font-size: 12px;}#foot_bm a, #foot_bm, p, p a{color: #666;position: relative;}</style><script>function startMove(obj,json,fnEnd){ clearInterval(obj.timer); obj.timer=setInterval(function() { var bStop=true; for (var attr in json) { var now=0; if(attr=="opacity") { now=Math.round(parseFloat(getStyle(obj,attr))*100); } else { now=parseInt(getStyle(obj,attr)); } var speed=(json[attr]-now)/10; speed=speed>0?Math.ceil(speed):Math.floor(speed); if(now!=json[attr])bStop=false; if(attr=="opacity") { obj.style.filter="alpha(opacity:"+(now+speed)+")"; obj.style.opacity=(now+speed)/100; } else { obj.style[attr]=(now+speed)+"px"; } } if(bStop) { clearInterval(obj.timer); if(fnEnd)fnEnd(); } }, 30)}function startFlex(obj,json,fnEnd){ clearInterval(obj.timer); obj.timer=setInterval(function() { var bStop=true; var cur=0; for(var attr in json) { if(!obj.oSpeed)obj.oSpeed={}; if(!obj.oSpeed[attr])obj.oSpeed[attr]=0; cur=parseInt(getStyle(obj,attr)); if(Math.abs(json[attr]-cur)>1 || Math.abs(obj.oSpeed[attr])>1) { bStop=false; obj.oSpeed[attr]+=(json[attr]-cur)/5; obj.oSpeed[attr]*=0.7; var maxSpeed=65; if(Math.abs(obj.oSpeed[attr])>maxSpeed) { obj.oSpeed[attr]=obj.oSpeed[attr]>0?maxSpeed:-maxSpeed; } obj.style[attr]=cur+obj.oSpeed[attr]+"px"; } } if(bStop) { clearInterval(obj.timer); if(fnEnd)fnEnd(); } }, 30);}function getStyle(obj,name){ if(obj.currentStyle) { return obj.currentStyle[name]; } else { return getComputedStyle(obj,false)[name]; }}window.onload=function(){ var oCs=document.getElementById('cs'); var oBtn=document.getElementById('btn').getElementsByTagName('span')[0]; var oImg=document.getElementById('bg'); var oLi=document.getElementById('qqlist').getElementsByTagName('li'); var on=0; for(var i=0; i<oLi.length; i++) { oLi[i].style.left=oLi[i].offsetLeft+"px"; oLi[i].style.top=oLi[i].offsetTop+"px"; } for(var i=0; i<oLi.length; i++) { oLi[i].style.position="absolute"; oLi[i].style.margin=0; } function showImg() { oImg.style.display="block"; startMove(oImg,{opacity:80},function() { showQQ(350); }); } function showQQ(iTarget) { var i=1; startFlex(oLi[0],{left:iTarget}); timer=setInterval(function() { startFlex(oLi[i],{left:iTarget}); i++; if(i>=oLi.length) { clearInterval(timer); } }, 20); } oBtn.onclick=function() { if(on==0) { startFlex(oCs,{height:500},function() { showImg(); oBtn.innerHTML="CLOSE"; }); on=1; } else { showQQ(-200); timer2=setInterval(function() { startMove(oImg,{opacity:0},function() { oImg.style.display="none"; startMove(oCs,{height:0}); }) if(oCs.style.height==0+"px") { clearInterval(timer2); oBtn.innerHTML="CONTACT US"; } },500); on=0; } }}</script></head><body><div id="cs"> <div id="qqlist"> <ul> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的網站"/> 售前咨詢</a></li> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的站名"/> 售前咨詢</a></li> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的站名"/> 售前咨詢</a></li> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的站名"/> 售前咨詢</a></li> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的站名"/> 售前咨詢</a></li> <li><a target="_blank" ><img border="0" src="http://wpa.qq.com/pa?p=2:123456789:52" alt="點這里發消息" title="您的站名"/> 售前咨詢</a></li> </ul> </div> <div id="bg"><img src="images/bgbg.png"/></div></div><div id="btn"><span>聯系我們</span></div></body></html>希望本文所述對大家JavaScript程序設計有所幫助。
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