html5 canvas js(数字时钟)实例代码

代码如下:

<!doctype html>
<html>
    <head>
        <title>canvas dClock</title>
    </head>
    <body>
        <canvas id = "clock" width = "500px" height = "200px">
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        </canvas>
        <script type = "text/javascript">
            var clock = document.getElementById("clock");
            var cxt = clock.getContext("2d");

//显示数字时钟
            function showTime(m, n) {
                cxt.clearRect(0, 0, 500, 500);

var now = new Date;
                var hour = now.getHours();
                var min = now.getMinutes();
                var sec = now.getSeconds();
                var msec = now.getMilliseconds();
                hour = hour >= 10 ? hour : "0" + hour;
                min = min >= 10 ? min : "0" + min;
                sec = sec >= 10 ? sec : "0" + sec;
                msec = (msec >= 10 && msec < 100) ? ("0" + msec) : (msec >= 0 && msec < 10) ? ("00" + msec) : msec;

bdigital(m, n, hour);
                bdigital(m + 160, n, min);
                bdigital(m + 320, n, sec);
                //tdigital(m + 480, n, msec);

//三位数的显示
                function tdigital(x, y, num) {
                    var ge = num % 10;
                    var shi = (parseInt(num / 10)) % 10;
                    var bai = parseInt((parseInt(num / 10)) / 10) % 10;
                    digital(x, y, bai);
                    digital(x + 70, y, shi);
                    digital(x + 140, y, ge);
                }

//两位数的显示
                function bdigital(x, y, num) {
                    var ge = num % 10;
                    var shi = (parseInt(num / 10)) % 10;
                    digital(x, y, shi);
                    digital(x + 70, y, ge);
                }

//画：
                //小时与分钟之间
                cxt.lineWidth = 5;
                cxt.strokeStyle = "#000";
                cxt.fillStyle = "#000";
                cxt.beginPath();
                cxt.arc(m + 140, n + 80, 3, 0, 360, false);
                cxt.fill();
                cxt.closePath();
                cxt.stroke();

cxt.lineWidth = 5;
                cxt.strokeStyle = "#000";
                cxt.fillStyle = "#000";
                cxt.beginPath();
                cxt.arc(m + 140, n + 100, 3, 0, 360, false);
                cxt.fill();
                cxt.closePath();
                cxt.stroke();

//分钟与秒之间
                cxt.lineWidth = 5;
                cxt.strokeStyle = "#000";
                cxt.fillStyle = "#000";
                cxt.beginPath();
                cxt.arc(m + 300, n + 80, 3, 0, 360, false);
                cxt.fill();
                cxt.closePath();
                cxt.stroke();

cxt.lineWidth = 5;
                cxt.strokeStyle = "#000";
                cxt.fillStyle = "#000";
                cxt.beginPath();
                cxt.arc(m + 300, n + 100, 3, 0, 360, false);
                cxt.fill();
                cxt.closePath();
                cxt.stroke();

//秒与毫秒之间一个.
//                cxt.lineWidth = 5;
//                cxt.strokeStyle = "#000";
//                cxt.fillStyle = "#000";
//                cxt.beginPath();
//                cxt.arc(m + 460, n + 100, 3, 0, 360, false);
//                cxt.fill();
//                cxt.closePath();
//                cxt.stroke();
            }

//显示一位数字
            function digital(x, y, num) {
                //设置风格
                cxt.lineWidth = 5;
                cxt.strokeStyle = "#000";

//a
                function a() {
                    cxt.beginPath();
                    cxt.moveTo(x, y);
                    cxt.lineTo(x + 50, y);
                    cxt.closePath();
                    cxt.stroke();
                }

//b
                function b() {
                    cxt.beginPath();
                    cxt.moveTo(x + 55, y + 5);
                    cxt.lineTo(x + 55, y + 55);
                    cxt.closePath();
                    cxt.stroke();
                }

//c
                function c() {
                    cxt.beginPath();
                    cxt.moveTo(x + 55, y + 60);
                    cxt.lineTo(x + 55, y + 110);
                    cxt.closePath();
                    cxt.stroke();
                }

//d
                function d() {
                    cxt.beginPath();
                    cxt.moveTo(x + 50, y + 115);
                    cxt.lineTo(x, y + 115);
                    cxt.closePath();
                    cxt.stroke();
                }

//e
                function e() {
                    cxt.beginPath();
                    cxt.moveTo(x - 5, y + 110);
                    cxt.lineTo(x - 5, y + 60);
                    cxt.closePath();
                    cxt.stroke();
                }

//f
                function f() {
                    cxt.beginPath();
                    cxt.moveTo(x - 5, y + 55);
                    cxt.lineTo(x - 5, y + 5);
                    cxt.closePath();
                    cxt.stroke();
                }

//g
                function g() {
                    cxt.beginPath();
                    cxt.moveTo(x, y + 57.5);
                    cxt.lineTo(x + 50, y + 57.5);
                    cxt.closePath();
                    cxt.stroke();
                }

//0
                function zero() {
                    a(); b(); c(); d(); e(); f();
                }
                //1
                function one() {
                    b(); c();
                }
                //2
                function two() {
                    a(); b(); d(); e(); g();
                }
                //3
                function three() {
                    a(); b(); c(); d(); g();
                }
                //4
                function four() {
                    b(); c(); f(); g();
                }
                //5
                function five() {
                    a(); c(); d(); f(); g();
                }
                //6
                function six() {
                    a(); c(); d(); e(); f(); g();
                }
                //7
                function seven() {
                    a(); b(); c();
                }
                //8
                function eight() {
                    a(); b(); c(); d(); e(); f(); g();
                }
                //9
                function nine() {
                    a(); b(); c(); d(); f(); g();
                }

//数字n
                function number(n) {
                    switch (n) {
                        case 0: zero(); break;
                        case 1: one(); break;
                        case 2: two(); break;
                        case 3: three(); break;
                        case 4: four(); break;
                        case 5: five(); break;
                        case 6: six(); break;
                        case 7: seven(); break;
                        case 8: eight(); break;
                        case 9: nine(); break;
                    }
                }
                number(num);
            }

showTime(1, 45);
            setInterval("showTime(1,45)", 1000);
        </script>
    </body>
</html>