js implements a simple 24-hour clock
This time I will bring you js to implement a simple 24-hour clock. What are the precautions to implement a simple 24-hour clock in js? The following is a practical case, let's take a look.
js codevar canvas = document.getElementById("clock");
var clock = canvas.getContext("2d");
function zhong() {
clock.save();
//开始画外层圆
clock.translate(200, 200);
clock.strokeStyle = 'black';
clock.lineWidth = 3;
clock.beginPath();
clock.arc(0, 0, 195, 0, 2 * Math.PI);
clock.stroke();
//时钟上的数字
var shuzi = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2];
clock.font = "30px Arial";
clock.textAlign = "center";
clock.textBaseline = "middle";
shuzi.forEach(function(number, i) {
var rad = 2 * Math.PI / 12 * i;
var x = Math.cos(rad) * 180;
var y = Math.sin(rad) * 180;
clock.fillText(number, x, y);
});
// 小圆点
for(j = 0; j < 60; j++) {
var h = 2 * Math.PI / 60 * j;
var m = Math.cos(h) * 180;
var n = Math.sin(h) * 180;
clock.fillStyle = 'black';
clock.beginPath();
if(j % 5 === 0) {
continue;
}
clock.arc(m, n, 3, 0, 2 * Math.PI);
clock.fill();
}
}
function drawHour(hour,min) {
clock.save();
var rad = 2 * Math.PI / 12 * hour;
var red = 2 *Math.PI/12/60*min;
clock.rotate(rad+red);
clock.lineWidth = 10;
clock.lineCap = "round";
clock.beginPath();
clock.moveTo(0, 5);
clock.lineTo(0, -100);
clock.stroke();
clock.restore();
}
function drawmin(min) {
clock.save();
var rad = 2 * Math.PI / 60 * min;
clock.rotate(rad);
clock.lineWidth = 5;
clock.lineCap = "round";
clock.beginPath();
clock.moveTo(0, 10);
clock.lineTo(0, -150);
clock.stroke();
clock.restore();
}
function drawsec(sec) {
clock.save();
var rad = 2 * Math.PI / 60 * sec;
clock.rotate(rad);
clock.lineWidth = 2;
clock.lineCap = "round";
clock.strokeStyle = "red";
clock.beginPath();
clock.moveTo(0, 10);
clock.lineTo(0, -180);
clock.stroke();
clock.restore();
}
function dian() {
clock.fillStyle = "white";
clock.beginPath();
clock.arc(0, 0, 2, 0, 2 * Math.PI);
clock.fill();
}
function xuanzhuan() {
clock.clearRect(0,0,400,400);
zhong();
var now = new Date();
var hour = now.getHours();
var min = now.getMinutes();
var sec = now.getSeconds();
drawHour(hour,min);
drawmin(min);
drawsec(sec);
dian();
clock.restore();
}
xuanzhuan();
setInterval(xuanzhuan, 1000);The above is the detailed content of js implements a simple 24-hour clock. For more information, please follow other related articles on the PHP Chinese website!
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