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index.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>画板</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<canvas id="canvas"></canvas>
<script>
let canvas = document.getElementById("canvas");
canvas.width = document.documentElement.clientWidth
canvas.height = document.documentElement.clientHeight
let ctx = canvas.getContext("2d");
ctx.fillStyle = "black";
ctx.strokeStyle = 'none';
ctx.lineWidth = 8;
ctx.lineCap = "round";
let painting = false
let last
let isTouchDevice = 'ontouchstart' in
document.documentElement;
if(isTouchDevice){
canvas.ontouchstart = (e) => {
let x = e.touches[0].clientX
let y = e.touches[0].clientY
last = [x, y]
}
canvas.ontouchmove = (e) => {
let x = e.touches[0].clientX
let y = e.touches[0].clientY
drawLine(last[0], last[1], x, y)
last = [x, y]
}
}else{
canvas.onmousedown = (e) => {
painting = true
last = [e.clientX, e.clientY]
}
canvas.onmousemove = (e) => {
if (painting === true) {
drawLine(last[0], last[1] ,e.clientX, e.clientY)
last = [e.clientX, e.clientY]
}
}
canvas.onmouseup = () => {
painting = false
}
}
function drawLine(x1, y1, x2, y2){
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.stroke()
}
</script>
</body>
</html>