定义一个HTML5画布的宽度,我们可以使用lineWidth,设置画布的谱线宽度属性上下文。lineWidth属性必须设置调用stroke()。
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
context.beginPath();
context.moveTo(100, 150);
context.lineTo(450, 50);
context.lineWidth = 15;
context.stroke();
</script>
</body>
</html>