<html>
<head>
<title>奥运五环</title>
</head>
<body>
<script>
//x、y分别是点的横纵坐标，color是点的颜色
function createPoint(x,y,color){
document.write("<div style='overflow:hidden; background-color:"+color+";width:1px;line-height:1px;top:"+y+"px;left:"+x+"px;position:absolute;'> </div>");
}
//x、y是圆心坐标，r是圆的最大半径，w是圆边宽度（当宽度过大时，有的浏览器解析速度会超时），color是圆的颜色
function createCircle(x,y,r,w,color){
if(w<=0){alert("圆的宽度必须大于零！！");return;}
if(r<=w){w=r;}
for(var j=r-w;j<r+1;j++){
for(var i=0;i<720;i++){
var single=(i*0.5/180)*3.1415926
var top=y+Math.floor(j*Math.cos(single));
var left=x+Math.floor(j*Math.sin(single));
createPoint(left,top,color);
}
}
}
createCircle(322,312,90,10,"#ff0000");
createCircle(512,312,90,10,"#00ff00");
createCircle(702,312,90,10,"#0000ff");
createCircle(417,392,90,10,"#000000");
createCircle(605,392,90,10,"#123456");
</script>
</body>
</html>
