<!DOCTYPE html>
<html>
<body>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.lineWidth="5";
ctx.strokeStyle="red"; // 绿色路径
ctx.moveTo(0,75);
ctx.lineTo(250,75);
ctx.stroke(); // 进行绘制
ctx.strokeStyle="blue"; // 紫色路径
ctx.moveTo(50,0);
ctx.lineTo(150,130);
</script>
</body>
</html>