<!DOCTYPE HTML>
<html lang="en-US">
<head>
<title></title>
<meta charset="UTF-8">
<script src="<a ></script</a>>
</head>
<style>
canvas{ border:2px solid #000;}
</style>
<body>
<canvas id="draw" width="500" height="500"></canvas>
<script type="text/javascript">
$(document).ready(function(){
var canvas=document.getElementById("draw");
var draw=canvas.getContext("2d");
draw.lineWidth=5; //線條粗細
draw.strokeStyle="red"; //顏色
var godraw=false;
//按下鼠標
$("#draw").mousedown(function(e){
//準確坐標
var mouseX=e.pageX-this.offsetLeft;
var mouseY=e.pageY-this.offsetTop;
draw.moveTo(mouseX,mouseY);
godraw=true;</p>
<p> })
//放開鼠標
$("#draw").mouseup(function(e){
godraw=false;
})
//移動鼠標
$("#draw").mousemove(function(e){
if(godraw){
var mouseX=e.pageX-this.offsetLeft;
var mouseY=e.pageY-this.offsetTop;
draw.lineTo(mouseX+4,mouseY+4);
draw.stroke();
}</p>
<p> })
})
</script>
</body>
</html>
