我正在尝试对一些 javascript 代码进行故障排除，但我无法在 html 画布上显示任何 console.log 信息，以便我可以看到变量的值。有这样做的基本方法吗？
// JavaScript Document
/*jshint esversion: 6 */
const canvas = document.getElementById('canvas1');
const ctx = canvas.getContext('2d');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
console.log("Hello world!");
alert("Just executed this code!");
canvas {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(10,10,153,0.5);
}
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie-edge">
<title>Art01a2020</title>
<link rel="stylesheet" href="style4.css">
</head>
<body>
<canvas id="canvas1"></canvas>
<script type="text/javascript" src="script4.js"></script>
</body>
</html>
元芳怎么了
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