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var c=this.callout[0];
var cxt=c.getContext("2d");
cxt.beginPath();
cxt.moveTo(x0,y0);
cxt.lineTo(x1,y1);
cxt.lineTo(x2,y2);
cxt.lineTo(x3,y3);
cxt.lineTo(x4,y4);
cxt.closePath();
cxt.fillStyle="#000000";
cxt.fillText("hello world", x,y);
cxt.fill();
cxt.stroke();
<!DOCTYPE html>
<html>
<head>
<title>Canvas beginePath example</title>
<script>
function beginDemo() {
var canvas = document.getElementById("demo")
var ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.lineWidth = "3";
ctx.strokeStyle = "blue";
ctx.fillStyle = "orange";
ctx.moveTo(100, 100);
ctx.lineTo(100, 400);
ctx.lineTo(400, 400);
ctx.lineTo(400, 100);
ctx.closePath();
ctx.fill();
ctx.stroke();
ctx.font = "32pt Arial";
ctx.strokeText("我是中文字", 120, 200);
ctx.strokeStyle = "red";
ctx.stroke();
}
</script>
</head>
<body onload="beginDemo();">
<canvas id="demo" width="800" height="800"></canvas>
</body>
</html>