| 基于Canvas制作的动态时钟demo，供大家参考，具体内容如下 <!DOCTYPE html><html> <head> <meta charset="utf-8"> <title>动态时钟</title> <script type="text/javascript" src="js/lattice.js"></script> <script type="text/javascript" src="js/script.js"></script> <style type="text/css"> *{ padding: 0; margin: 0; } #canvasBox{ border-width: 2px; border-color: black; border-style: solid; width: 80%; margin: 0 auto; } </style> </head> <body> <!-- 将canvas放到一个盒子中，用盒子控制canvas的位置 --> <div id="canvasBox"> <canvas id="canvas"> 此浏览器不支持canvas </canvas> </div> </body></html>lattice.js lattice = [ [ [0,0,1,1,1,0,0], [0,1,1,0,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,0,1,1,0], [0,0,1,1,1,0,0] ],//0 [ [0,0,0,1,1,0,0], [0,1,1,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [1,1,1,1,1,1,1] ],//1 [ [0,1,1,1,1,1,0], [1,1,0,0,0,1,1], [0,0,0,0,0,1,1], [0,0,0,0,1,1,0], [0,0,0,1,1,0,0], [0,0,1,1,0,0,0], [0,1,1,0,0,0,0], [1,1,0,0,0,0,0], [1,1,0,0,0,1,1], [1,1,1,1,1,1,1] ],//2 [ [1,1,1,1,1,1,1], [0,0,0,0,0,1,1], [0,0,0,0,1,1,0], [0,0,0,1,1,0,0], [0,0,1,1,1,0,0], [0,0,0,0,1,1,0], [0,0,0,0,0,1,1], [0,0,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,1,1,0] ],//3 [ [0,0,0,0,1,1,0], [0,0,0,1,1,1,0], [0,0,1,1,1,1,0], [0,1,1,0,1,1,0], [1,1,0,0,1,1,0], [1,1,1,1,1,1,1], [0,0,0,0,1,1,0], [0,0,0,0,1,1,0], [0,0,0,0,1,1,0], [0,0,0,1,1,1,1] ],//4 [ [1,1,1,1,1,1,1], [1,1,0,0,0,0,0], [1,1,0,0,0,0,0], [1,1,1,1,1,1,0], [0,0,0,0,0,1,1], [0,0,0,0,0,1,1], [0,0,0,0,0,1,1], [0,0,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,1,1,0] ],//5 [ [0,0,0,0,1,1,0], [0,0,1,1,0,0,0], [0,1,1,0,0,0,0], [1,1,0,0,0,0,0], [1,1,0,1,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,1,1,0] ],//6 [ [1,1,1,1,1,1,1], [1,1,0,0,0,1,1], [0,0,0,0,1,1,0], [0,0,0,0,1,1,0], [0,0,0,1,1,0,0], [0,0,0,1,1,0,0], [0,0,1,1,0,0,0], [0,0,1,1,0,0,0], [0,0,1,1,0,0,0], [0,0,1,1,0,0,0] ],//7 [ [0,1,1,1,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,1,1,0] ],//8 [ [0,1,1,1,1,1,0], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [1,1,0,0,0,1,1], [0,1,1,1,0,1,1], [0,0,0,0,0,1,1], [0,0,0,0,0,1,1], [0,0,0,0,1,1,0], [0,0,0,1,1,0,0], [0,1,1,0,0,0,0] ],//9 [ [0,0,0,0], [0,0,0,0], [0,1,1,0], [0,1,1,0], [0,0,0,0], [0,0,0,0], [0,1,1,0], [0,1,1,0], [0,0,0,0], [0,0,0,0] ]//: ]; script.js var CANVAS_WIDTH;var CANVAS_HEIGHT = 600;//设置点阵中圆的半径var RADIUS = 8;//设置时钟距离边框的位置var MARGIN_LEFT = 100;var MARGIN_TOP = 40; //获取初始状态的时间var time = new Date();var hours = time.getHours();var minutes = time.getMinutes();var seconds = time.getSeconds(); //用于存储小球对象var balls = [];//小球颜色var colors = ["red","orenge","yellow","green","blue","purple","pink"] window.onload = function(){ //获得canvas外部盒子的宽度，使canvas与外部盒子宽度相同 var canvasBox = document.getElementById("canvasBox"); var boxWidth = getComputedStyle(canvasBox,null); CANVAS_WIDTH = parseInt(boxWidth.width); //设置canvas宽高并获得画笔对象 var canvas = document.getElementById("canvas"); canvas.width = CANVAS_WIDTH; canvas.height = CANVAS_HEIGHT; var context = canvas.getContext("2d"); //定时调用，50毫秒调用一次 setInterval(function(){ //绘制函数 draw(context); },50); function draw(ctx){ //刷新屏幕 ctx.clearRect(0,0,CANVAS_WIDTH,CANVAS_HEIGHT); //获取当前时间 var curTime = new Date(); var curHours = curTime.getHours(); var curMinutes = curTime.getMinutes(); var curSeconds = curTime.getSeconds(); //画小时 drawLattice(MARGIN_LEFT,MARGIN_TOP,parseInt(curHours/10),ctx); drawLattice(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curHours%10),ctx); //画冒号 drawLattice(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,ctx); //画分钟 drawLattice(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10),ctx); drawLattice(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10),ctx); //画冒号 drawLattice(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,ctx); //画秒 drawLattice(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10),ctx); drawLattice(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds%10),ctx); //更新时间并绘制小球 update(context,curHours,curMinutes,curSeconds); //观察小球数量 //console.log(balls.length); } //参数： //x：绘制数字点阵的左上角的横坐标 //y：绘制数字点阵的左上角的纵坐标 //num：要绘制的数字，实际上是lattice的索引，10表示冒号 //ctx：画笔 function drawLattice(x,y,num,ctx){ for(var i=0;i<lattice[num].length;i++){ for(var j=0;j<lattice[num][i].length;j++){ if(lattice[num][i][j]==1){ ctx.beginPath(); ctx.fillStyle = "blue"; ctx.arc(x+j*2*(RADIUS+1)+(RADIUS+1),y+i*2*(RADIUS+1)+(RADIUS+1),RADIUS,0,2*Math.PI); ctx.fill(); ctx.closePath(); } } } } //更新时间并绘制小球 function update(ctx,curHours,curMinutes,curSeconds){ if(seconds!=curSeconds){ //更新小时 if(parseInt(curHours/10)!=parseInt(hours/10)){ addBalls(MARGIN_LEFT,MARGIN_TOP,parseInt(curHours/10)); } if(parseInt(curHours%10)!=parseInt(hours%10)){ addBalls(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(curHours%10)); } //更新分钟 if(parseInt(curMinutes/10)!=parseInt(minutes/10)){ addBalls(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes/10)); } if(parseInt(curMinutes%10)!=parseInt(minutes%10)){ addBalls(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(curMinutes%10)); } //更新秒 if(parseInt(curSeconds/10)!=parseInt(seconds/10)){ addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds/10)); } if(parseInt(curSeconds%10)!=parseInt(seconds%10)){ addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(curSeconds%10)); } //更新所有时间 hours = curHours; minutes = curMinutes; seconds = curSeconds; } //绘制小球 drawBalls(ctx); //更新小球运动 updateBalls(); } //添加单个小球 //参数： //x：小球的横坐标 //y：小球的纵坐标 //num：变化的时间数字 function addBalls(x,y,num){ for(var i=0;i<lattice[num].length;i++){ for(var j=0;j<lattice[num][i].length;j++){ if(lattice[num][i][j]==1){ //添加一个小球对象 var ball = { //坐标 x:x+j*2*(RADIUS+1)+(RADIUS+1), y:y+i*2*(RADIUS+1)+(RADIUS+1), //重力加速度 g:1.5+Math.random(), //x、y方向的速度 vx:Math.pow(-1,Math.ceil(Math.random()*1000))*5, vy:-5, //小球颜色 color:colors[Math.floor(Math.random()*colors.length)] } //将小球添加进储存队列中 balls.push(ball); } } } } //绘制小球 function drawBalls(ctx){ for(var i=0;i<balls.length;i++){ ctx.beginPath(); ctx.fillStyle = balls[i].color; ctx.arc(balls[i].x,balls[i].y,RADIUS,0,2*Math.PI,true); ctx.fill(); ctx.closePath(); } } //更新小球运动 function updateBalls(){ //更新储存数组中的小球的动态 for(var i=0;i<balls.length;i++){ balls[i].x += balls[i].vx; balls[i].y += balls[i].vy; balls[i].vy += balls[i].g; //边缘碰撞检测 if(balls[i].y>=CANVAS_HEIGHT-RADIUS){ balls[i].y=CANVAS_HEIGHT-RADIUS; //模拟碰撞反弹和阻力 balls[i].vy=-balls[i].vy*0.6; } } //当小球滚出画布便可以从数组中删除，以下是删除算法 //储存应当保留的小球的数量 var numBall = 0; for(var i=0;i<balls.length;i++){ if(balls[i].x+RADIUS>0&&balls[i].x-RADIUS<CANVAS_WIDTH){ //若判断当前小球在屏幕内，则将此小球尽量靠前，则每次循环后，数组最后面的小球就是滚出画布的小球 balls[numBall] = balls[i]; numBall++; } } //从数组后面删除小球 while(balls.length>numBall){ balls.pop(); } }};效果图： 
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