效果图

canvas绘制三角形_canvas

html结构

    

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge">

<title>canvas2</title>

<link rel="stylesheet" href="">

</head>

<body>

<canvas id="canvas" style ="border:1px solid #aaa;diplay:block;margin:50px auto;">

当前浏览器不支持canvas,请更换浏览器后再试

</canvas>

</body>

</html>

js脚本

    <script>

window.onload = function(){

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


canvas.width = 800;

canvas.height = 800;


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


context.beginPath();

context.moveTo(100,100);

context.lineTo(700,700);

context.lineTo(100,700);

context.lineTo(100,100);

context.closePath();


context.lineWidth = 10;

context.strokeStyle = "#058";

context.stroke();

}

</script>

canvas绘制三角形_canvas_02