0501網頁塗鴉闆

2023-08-04 17:16:24
<!DOCTYPE html>
<html >
<head>
    <meta charset="UTF-8">
    <title>網頁塗鴉闆</title>
</head>
<body>
<center>
    <canvas id="cavsElem"></canvas>
</center>
<script>
    (function() {
        var canvas = document.getElementById('cavsElem');
        var context = canvas.getContext('2d');
        canvas.width = 900;
        canvas.height = 600;
        canvas.style.border = "1px solid #000";
        canvas.onmousedown = function (e) {
            var x = e.clientX - canvas.getBoundingClientRect().left;
            var y = e.clientY - canvas.getBoundingClientRect().top;
            context.beginPath();
            context.moveTo(x, y);
            canvas.onmousemove = function (event) {
                var x = event.clientX - canvas.getBoundingClientRect().left;
                var y = event.clientY - canvas.getBoundingClientRect().top;
                context.lineTo(x, y);
                context.stroke();
            };
            canvas.onmouseup = function (event) {
                canvas.onmousemove = null;
            };
        };
    }());


</script>
</body>
</html>
袁同學——2019年5月26日