当linewidth=10的时候我得到了一个缺角的三角形，谁能帮我修改下代码让我得到一个完整的三角形

源自：2-3 线条组成的图形和beginPath

<!DOCTYPE html>

<html>

<head>

<title>Canvas 特效</title>

</head>

<body>

当前浏览器不支持Canvas，请更换浏览器后再试

</canvas>

window.onload = function(){

var canvas = document.getElementById("canvas");

canvas.width = 800;

canvas.height = 800;

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

context.moveTo(100,100);

context.lineTo(700,700);

context.lineTo(100,700);

context.lineTo(100,100);

context.lineWidth = 10;

context.strokeStyle = "red";

context.stroke();

}

</script>

</body>

</html>

提问者：白水向前冲 2014-12-02 13:22