<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
</head>
<body>
<canvas id="demo" width="600px" height="600px">
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<!-- flash -->
</canvas>
<script>
window.onload = function(){
var canvas = document.getElementById('demo');
var ctx = canvas.getContext("2d");
ctx.moveTo(100, 100);//画笔移动到100,100
ctx.lineTo(200, 100);//画直线到200,100
ctx.lineTo(100, 200);
//ctx.lineTo(100, 100);
ctx.closePath();//闭合路径
//设置线宽
ctx.lineWidth = 4;
ctx.strokeStyle = 'rgba(233,233,233,.8)';//设置描边样式
ctx.stroke();//描边
ctx.fillStyle = "blue";
ctx.fill();
}
</script>
</body>
</html>