老師講得太好了， 不僅學(xué)習(xí)到了新的canvas api，更重要的是一些基于canvas的編程思路，受益匪淺，點贊！
2019-06-16
var canvas = document.getElementById("canvas");
canvas.width = 800;
canvas.height = 800;
context = canvas.getContext("2d");
context.beginPath();
context.strokeStyle = "red";
context.linewidth = 10;
context.moveTo(10, 10);
context.lineTo(50, 50);
context.stroke();
context.endPath();
canvas.width = 800;
canvas.height = 800;
context = canvas.getContext("2d");
context.beginPath();
context.strokeStyle = "red";
context.linewidth = 10;
context.moveTo(10, 10);
context.lineTo(50, 50);
context.stroke();
context.endPath();
