Posted in Javascript onAugust 06, 2015
本文实例讲述了js简单实现标签云效果。分享给大家供大家参考。具体如下：
这里的JavaScript标签云，基于妙味课堂miaov.js文件，非常流行的网页效果，在网页的右侧或左侧开辟一小块地方，用来显示热门的标签，形式就选择标签云吧，绝对酷哦，相信你也会喜欢。
运行效果如下图所示：
具体代码如下：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js标签云</title>
<style>
body {background: #000;}
#div1 {position:relative; width:450px; height:450px; margin: 20px auto 0; }
#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#fff; font-weight:bold; text-decoration:none; padding: 3px 6px; }
#div1 a:hover {border: 1px solid #eee; background: #000; }
#div1 .blue {color:blue;}
#div1 .red {color:red;}
#div1 .yellow {color:yellow;}
p { font: 16px Microsoft YaHei; text-align: center; color: #ba0c0c; }
p a { font-size: 14px; color: #ba0c0c; }
p a:hover { color: red; }
p a:hover {color:red; }
</style>
<script type="text/javascript" src="miaov.js"></script>
</head>
<body>
<div id="div1">
<a href="#">JS课程</a>
<a href="#" class="red">教程</a>
<a href="#">回头一眸</a>
<a href="#">精品</a>
<a href="#" class="blue">源码下载</a>
<a href="#">SEO</a>
<a href="#" class="red">特效</a>
<a href="#">继承</a>
<a href="#" class="red">三水点靠木</a>
<a href="#" class="blue">OOP</a>
<a href="#">XHTML</a>
<a href="#">W3C</a>
<a href="#">石川</a>
<a href="#" class="yellow">人生如歌</a>
<a href="#">blue</a>
</div>
</body>
</html>
miaov.js代码如下：
var radius=120;var dtr=Math.PI/180;var d=300;var mcList=[];var active=false;var lasta=1;var lastb=1;var distr=true;var tspeed=10;var size=250;var mouseX=0;var mouseY=0;var howElliptical=1;var aA=null;var oDiv=null;window.onload=function()
{var i=0;var oTag=null;oDiv=document.getElementById('div1');aA=oDiv.getElementsByTagName('a');for(i=0;i<aA.length;i++)
{oTag={};oTag.offsetWidth=aA[i].offsetWidth;oTag.offsetHeight=aA[i].offsetHeight;mcList.push(oTag);}
sineCosine(0,0,0);positionAll();oDiv.onmouseover=function()
{active=true;};oDiv.onmouseout=function()
{active=false;};oDiv.onmousemove=function(ev)
{var oEvent=window.event||ev;mouseX=oEvent.clientX-(oDiv.offsetLeft+oDiv.offsetWidth/2);mouseY=oEvent.clientY-(oDiv.offsetTop+oDiv.offsetHeight/2);mouseX/=5;mouseY/=5;};setInterval(update,30);};function update()
{var a;var b;if(active)
{a=(-Math.min(Math.max(-mouseY,-size),size)/ radius ) * tspeed;
b=(Math.min(Math.max(-mouseX,-size),size)/ radius ) * tspeed;
}
else
{a=lasta*0.98;b=lastb*0.98;}
lasta=a;lastb=b;if(Math.abs(a)<=0.01&&Math.abs(b)<=0.01)
{return;}
var c=0;sineCosine(a,b,c);for(var j=0;j<mcList.length;j++)
{var rx1=mcList[j].cx;var ry1=mcList[j].cy*ca+mcList[j].cz*(-sa);var rz1=mcList[j].cy*sa+mcList[j].cz*ca;var rx2=rx1*cb+rz1*sb;var ry2=ry1;var rz2=rx1*(-sb)+rz1*cb;var rx3=rx2*cc+ry2*(-sc);var ry3=rx2*sc+ry2*cc;var rz3=rz2;mcList[j].cx=rx3;mcList[j].cy=ry3;mcList[j].cz=rz3;per=d/(d+rz3);mcList[j].x=(howElliptical*rx3*per)-(howElliptical*2);mcList[j].y=ry3*per;mcList[j].scale=per;mcList[j].alpha=per;mcList[j].alpha=(mcList[j].alpha-0.6)*(10/6);}
doPosition();depthSort();}
function depthSort()
{var i=0;var aTmp=[];for(i=0;i<aA.length;i++)
{aTmp.push(aA[i]);}
aTmp.sort
(function(vItem1,vItem2)
{if(vItem1.cz>vItem2.cz)
{return-1;}
else if(vItem1.cz<vItem2.cz)
{return 1;}
else
{return 0;}});for(i=0;i<aTmp.length;i++)
{aTmp[i].style.zIndex=i;}}
function positionAll()
{var phi=0;var theta=0;var max=mcList.length;var i=0;var aTmp=[];var oFragment=document.createDocumentFragment();for(i=0;i<aA.length;i++)
{aTmp.push(aA[i]);}
aTmp.sort
(function()
{return Math.random()<0.5?1:-1;});for(i=0;i<aTmp.length;i++)
{oFragment.appendChild(aTmp[i]);}
oDiv.appendChild(oFragment);for(var i=1;i<max+1;i++){if(distr)
{phi=Math.acos(-1+(2*i-1)/max);
theta=Math.sqrt(max*Math.PI)*phi;}
else
{phi=Math.random()*(Math.PI);theta=Math.random()*(2*Math.PI);}
mcList[i-1].cx=radius*Math.cos(theta)*Math.sin(phi);mcList[i-1].cy=radius*Math.sin(theta)*Math.sin(phi);mcList[i-1].cz=radius*Math.cos(phi);aA[i-1].style.left=mcList[i-1].cx+oDiv.offsetWidth/2-mcList[i-1].offsetWidth/2+'px';aA[i-1].style.top=mcList[i-1].cy+oDiv.offsetHeight/2-mcList[i-1].offsetHeight/2+'px';}}
function doPosition()
{var l=oDiv.offsetWidth/2;var t=oDiv.offsetHeight/2;for(var i=0;i<mcList.length;i++)
{aA[i].style.left=mcList[i].cx+l-mcList[i].offsetWidth/2+'px';aA[i].style.top=mcList[i].cy+t-mcList[i].offsetHeight/2+'px';aA[i].style.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';aA[i].style.filter="alpha(opacity="+100*mcList[i].alpha+")";aA[i].style.opacity=mcList[i].alpha;}}
function sineCosine(a,b,c)
{sa=Math.sin(a*dtr);ca=Math.cos(a*dtr);sb=Math.sin(b*dtr);cb=Math.cos(b*dtr);sc=Math.sin(c*dtr);cc=Math.cos(c*dtr);}
希望本文所述对大家的javascript程序设计有所帮助。
js简单实现标签云效果实例
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