HTML5制作简单画板

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <title></title>
    <meta charset="UTF-8">
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
</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;        //线条粗细
    draw.strokeStyle="red";    //颜色
    var godraw=false;        
    
        //按下鼠标
    $("#draw").mousedown(function(e){
        //准确坐标
    var mouseX=e.pageX-this.offsetLeft;
    var mouseY=e.pageY-this.offsetTop;
    draw.moveTo(mouseX,mouseY);
    godraw=true;

    })
        //放开鼠标
        $("#draw").mouseup(function(e){
    godraw=false;
    })
        //移动鼠标
        $("#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();
        }

    })
    
    })
    </script>
</body>
</html>
PHP100的笔记
效果：
相关：
HTML画线