<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
canvas {
border: 1px solid #ccc;
}
</style>
</head>
<body>
<canvas width="600" height="400"></canvas>
<script>
var myCanvas = document.querySelector('canvas');
var ctx = myCanvas.getContext('2d');
/*画平行线*/
ctx.beginPath();/*Kai*/
/*蓝色 10px*/
ctx.moveTo(100,100);
ctx.lineTo(300,100);
ctx.strokeStyle = 'blue';
ctx.lineWidth = 10;
/*描边*/
ctx.stroke();
ctx.beginPath();/*Kai*/
/*红色 20px*/
ctx.moveTo(100,200);
ctx.lineTo(300,200);
ctx.strokeStyle = 'red';
ctx.lineWidth = 20;
/*描边*/
ctx.stroke();
ctx.beginPath();/*Kai*/
/*绿色 30px*/
ctx.moveTo(100,300);
ctx.lineTo(300,300);
ctx.strokeStyle = 'green';
ctx.lineWidth = 30;
/*描边*/
ctx.stroke();
</script>
</body>
</html>
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