canvas绘制五角星
<!DOCTYPE html>
<html lang="en">
<body>
<canvas width="900" height="900" id="myCanvas"></canvas>
<script>
var myCanvas = document.getElementById("myCanvas");
var context = myCanvas.getContext('2d');
context.fillStyle = 'rgb(255,100,0)';
context.lineWidth = 5;
var x=720,y=200;
for(var i=0;i<9;i++)
{
context.beginPath();
var x1 = 200*Math.sin(Math.PI/10);
var h1 = 200*Math.cos(Math.PI/10);
var h2 = 100*Math.tan(Math.PI/5);
context.lineTo(x+x1,y+h1);
context.lineTo(x-100,y+h2);
context.lineTo(x+100,y+h2);
context.lineTo(x-x1,y+h1);
context.lineTo(x,y);
context.fill();
}
</script>
</body>
</html>
代码就这样简简单单的完成了，运行结果图片如下：
