本文實(shí)例為大家分享了js時(shí)鐘特效 的具體代碼,供大家參考,具體內(nèi)容如下
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var canvas = document.getElementById("clock"); var clock = canvas.getContext("2d"); function zhong() { clock.save(); //開始畫外層圓 clock.translate(200, 200); clock.strokeStyle = 'black'; clock.lineWidth = 3; clock.beginPath(); clock.arc(0, 0, 195, 0, 2 * Math.PI); clock.stroke(); //時(shí)鐘上的數(shù)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); }); // 小圓點(diǎn) 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);
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