html5的canvas很强大利用其画布可轻松绘制贝塞尔曲线，为大家以后使用方便，特于此分享实现代码，有此需求的朋友可以参考下

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"

title用html5的canvas画布绘制贝塞尔曲线/title

/head

a href="http://keleyi.com/a/bjac/j77m9131.htm" target="_blank"原文

canvas height="300" width="400"/canvas

script type="text/javascript"

function draw(id)

{

var canvas=document.getElementById(id);

if(canvas==null)

return false;

var context=canvas.getContext('2d');

context.fill;

context.fillRect(0,0,400,300);

var n=0;

var dx=150;

var dy=150;

var s=100;

context.beginPath();

context.globalCompositeOperation='and';

context.fill;

context.stroke;

var x=Math.sin(0);

var y=Math.cos(0);

var dig=Math.PI/15*11;

for(var i=0;ii++)

{

var x=Math.sin(i*dig);

var y=Math.cos(i*dig);

context.bezierCurveTo(dx+x*s,dy+y*s-100,dx+x*s+100,dy+y*s,dx+x*s,dy+y*s);

}

context.closePath();

context.fill();

context.stroke();

}

draw("keleyi_com");

/script

/body

/html