canvas时钟效果图：
代码：
wxml:
<view style='width:100%;height:{{canvasHeight}}px' catchtap='goCountdown'catchlongtap='touchstart' catchtouchend='touchend'><canvas canvas-id='clock' style='width:100%;height:{{canvasHeight}}px'></canvas></view>
JS
Page({data: {width: 0,height: 0,showMask: false},onLoad: function (options) {var that = this//获取系统信息 wx.getSystemInfo({//获取系统信息成功，将系统窗口的宽高赋给页面的宽高 success: function (res) {that.width = res.windowWidththat.height = res.windowHeightthat.setData({canvasWidth: res.windowWidth * 0.9 * 0.52,canvasHeight: res.windowWidth * 0.9 * 0.52 * 0.9819,rightWidth: res.windowWidth * 0.9 * 0.47})}})},onReady: function () {this.drawClock();// 每40ms执行一次drawClock()，this.interval = setInterval(this.drawClock, 40);},// 所有的canvas属性以及Math.sin,Math.cos()等涉及角度的参数都是用弧度表示// 时钟drawClock: function () {let _this = this;const ctx = wx.createCanvasContext('clock');var height = this.height;var width = this.width;// 设置文字对应的半径var R = this.data.canvasWidth / 5;ctx.save();// 把原点的位置移动到屏幕中间，及宽的一半，高的一半ctx.translate(this.data.canvasWidth / 1.83, this.data.canvasHeight / 1.83);// 画外框function drawBackground() {ctx.setStrokeStyle('#4BB5C3');// 设置线条的粗细，单位pxctx.setLineWidth(8);// 开始路径ctx.beginPath();// 运动一个圆的路径// arc(x,y,半径,起始位置，结束位置，false为顺时针运动)ctx.arc(0, 0, R * 1.7, 0, 2 * Math.PI, false);ctx.closePath();// 描出点的路径ctx.stroke();};// 画时钟数function drawHoursNum() {ctx.setFontSize(20);// 圆的起始位置是从3开始的，所以我们从3开始填充数字var hours = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2];hours.forEach(function (hour, i) {var rad = (2 * Math.PI / 12) * i;var x = R * Math.cos(rad);var y = R * Math.sin(rad);if (hour == 12) {ctx.fillText(hour, x - 11, y + 6);} else if (hour == 6) {ctx.fillText(hour, x - 5, y + 10);} else if (hour == 3) {ctx.fillText(hour, x, y + 8);} else if (hour == 9) {ctx.fillText(hour, x - 10, y + 8);}else {//ctx.fillText(hour, x - 6, y + 6);}})};// 画数字对应的点function drawdots() {for (let i = 0; i < 60; i++) {var rad = 2 * Math.PI / 60 * i;var x = (R + 15) * Math.cos(rad);var y = (R + 15) * Math.sin(rad);ctx.beginPath();// 每5个点一个比较大if (i % 5 == 0) {ctx.arc(x, y, 2, 0, 2 * Math.PI, false);} else {// ctx.arc(x, y, 1, 0, 2 * Math.PI, false);}ctx.setFillStyle('black');ctx.fill();}ctx.closePath();}// 画时针function drawHour(hour, minute) {ctx.setStrokeStyle('#000000');// 保存画之前的状态ctx.save();ctx.beginPath();// 根据小时数确定大的偏移var rad = 2 * Math.PI / 12 * hour;// 根据分钟数确定小的偏移var mrad = 2 * Math.PI / 12 / 60 * minute;// 做旋转ctx.rotate(rad + mrad);ctx.setLineWidth(4);// 设置线条结束样式为圆ctx.setLineCap('round');// 时针向后延伸8个px；ctx.moveTo(0, 8);// 一开始的位置指向12点的方向，长度为R/2ctx.lineTo(0, -R / 2);ctx.stroke();ctx.closePath();// 返回画之前的状态ctx.restore();}// 画分针function drawMinute(minute, second) {ctx.save();ctx.beginPath();// 根据分钟数确定大的偏移var rad = 2 * Math.PI / 60 * minute;// 根据秒数确定小的偏移var mrad = 2 * Math.PI / 60 / 60 * second;ctx.rotate(rad + mrad);// 分针比时针细ctx.setLineWidth(3);ctx.setLineCap('round');ctx.moveTo(0, 10);// 一开始的位置指向12点的方向，长度为3 * R / 4ctx.lineTo(0, -3 * R / 4);ctx.stroke();ctx.closePath();ctx.restore();}// 画秒针function drawSecond(second, msecond) {ctx.save();ctx.beginPath();// 根据秒数确定大的偏移var rad = 2 * Math.PI / 60 * second;// 1000ms=1s所以这里多除个1000var mrad = 2 * Math.PI / 60 / 1000 * msecond;ctx.rotate(rad + mrad);ctx.setLineWidth(2);ctx.setStrokeStyle('#4BB5C3');ctx.setLineCap('round');ctx.moveTo(0, 12);ctx.lineTo(0, -R);ctx.stroke();ctx.closePath();ctx.restore();}//画出中间那个灰色的圆function drawDot() {ctx.beginPath();ctx.arc(0, 0, 4, 0, 2 * Math.PI, false);ctx.setFillStyle('#FFF9E6');ctx.setLineWidth(6);ctx.setStrokeStyle('#000000');ctx.stroke();ctx.fill();ctx.closePath();}//画蒙层function drawMask() {ctx.restore();ctx.rect(0, 0, width * 0.5, _this.data.canvasHeight);ctx.setFillStyle('rgba(0,0,0,.2)')ctx.fill()}function Clock() {// 实时获取各个参数var now = new Date();var hour = now.getHours();var minute = now.getMinutes()var second = now.getSeconds();var msecond = now.getMilliseconds();if (_this.data.showMask) {ctx.scale(0.98,0.98)}// 依次执行各个方法drawBackground();drawHoursNum();drawdots();drawSecond(second, msecond);drawHour(hour, minute);drawMinute(minute, second);drawDot();if (_this.data.showMask) {drawMask();}ctx.draw();}Clock();},goCountdown() {let _this = this;_this.setData({showMask: true})setTimeout(function () {_this.setData({showMask: false})wx.navigateTo({url: '/pages/countdown/countdown',})}, 200)},touchstart: function (e) {console.log(e)this.setData({showMask: true})},touchend: function (e) {this.setData({showMask: false})}})
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