JavaScript实现时钟特效

2024-04-02 19:04:59 591人浏览八月长安

摘要

本文实例为大家分享了javascript实现时钟特效的具体代码，供大家参考，具体内容如下简单时间实现： <!DOCTYPE html> <html> <

本文实例为大家分享了javascript实现时钟特效的具体代码，供大家参考，具体内容如下

简单时间实现：

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function startTime()
{
var today=new Date()
var h=today.getHours()
var m=today.getMinutes()
var s=today.getSeconds()
// add a zero in front of numbers<10
m=checkTime(m)
s=checkTime(s)
document.getElementById('txt').innerHTML=h+":"+m+":"+s
t=setTimeout('startTime()',500)
}

function checkTime(i)
{
if (i<10) 
  {i="0" + i}
  return i
}

</script>
</head>
<body onload="startTime()">
<div id="txt"></div>

</body>
</html>

时钟特效代码：

<!DOCTYPE html>
<html> 
<head> 
<meta charset="utf8"> 
<meta Http-equiv="X-UA-Compatible" content="IE=edge, chrome=1"> 
<meta name="keyWords" content="clock"> 
<meta name="description" content="This is a clock"> 
<title>Clock</title> 
</head> 
<body> 
<audio id="ticktock"> 
<source = src="ticktock.mp3" type="audio/mp3"> 
</audio> 
<script type="text/javascript"> 
 
Date.prototype.fORMat = function(fmt) { 
var map = {  
    "M+" : this.getMonth() + 1, 
    //月  
    "d+" : this.getDate(), 
    //日  
    "H+" : this.getHours(), 
    //24时  
     
     "h+" : this.getHours()%12 == 0 ? 12 : this.getHours()%12,
     //12时  
     "m+" : this.getMinutes(), 
     //分  
     "s+" : this.getSeconds(), 
     //秒  
     "S" : this.getMilliseconds(), 
     //毫秒  
     "t" : this.getHours() < 12 ? "AM" : "PM",  "T" : this.getHours() < 12 ? "上午" : "下午", 
 }; 
 var week = {  "0" : "日",  "1" : "一",  "2" : "二",  "3" : "三",  "4" : "四",  "5" : "五",  "6" : "六", } 
 var quarter = {  "0" : "一",  "1" : "二",  "2" : "三",  "3" : "四", } 
 if(/(y+)/.test(fmt)) {  
    fmt = fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
 } 
 if(/(E+)/.test(fmt)) {  
     var weekPreStr;  
     switch(RegExp.$1.length) {  
     case 1:  weekPreStr = "";  
     break;  
     case 2:  weekPreStr = "周";  
     break;  
     default:  weekPreStr = "星期";  
     break;  
 }  
 fmt = fmt.replace(RegExp.$1, weekPreStr + week[this.getDay()]); 
 } 
 if(/(q)/.test(fmt)) {  fmt = fmt.replace(RegExp.$1, quarter[Math.floor(this.getMonth() / 3)]); } 
     for(var key in map) {  
         if(new RegExp("(" + key + ")").test(fmt)) {  
         fmt = fmt.replace(RegExp.$1, RegExp.$1.length == 1 ? map[key] : ("00" + map[key]).substr((map[key]+"").length));  
         } 
     } 
return fmt; 
 } 
 </script>
 <script type="text/javascript">
 var canvas = document.createElement("canvas"); 
 document.body.appendChild(canvas); 
 var ctx = canvas.getContext("2d"); 
 var halfPI = Math.PI / 2; 
 var doublePI = Math.PI * 2; 
 //阴影级别 
 var shadowBlur = 10; 
 //阴影宽度 
 var shadowWidth = 10; 
 //阴影在X方向上的偏移 
 var shadowOffsetX = 5; 
 //阴影在Y方向上的便宜 
 var shadowOffsetY = 5; 
 //深色阴影 
 var shadowDarkColor = "rgba(0,0,0,0.8)"; 
 //浅色阴影 
 var shadowLightColor = "rgba(0,0,0,0.1)"; 
 //画布中心到边缘的内切圆半径 
 var canvasRadius = 250; 
 canvas.width = canvasRadius * 2; 
 canvas.height = canvasRadius * 2; 
 //获取画布中心的坐标 
 var cx = canvasRadius; 
 var cy = canvasRadius; 
 //时钟外圈的贝塞尔花纹个数 
 var bezierPatternCount = 10; 
 //时钟外圈的贝塞尔花纹波峰处半径 
 var bezierPeakRadius = canvasRadius - 10; 
 //时钟外圈的贝塞尔花纹一半的角度 
 var bezierHalfSpan = doublePI / bezierPatternCount / 2; 
 //时钟外圈的贝塞尔花纹底部半径 
 var bezierRadius = bezierPeakRadius - 20; 
 //时钟外圈的贝塞尔花纹颜色 
 var bezierPatternColor = "Plum"; 
 //时钟外圈半径 
 var clockBorderRadius = bezierRadius - 10; 
 //时钟外圈宽度 
 var clockBorderWidth = 10; 
 //时钟外圈颜色 
 var clockBorderColor = "Aqua"; 
 //时钟外圈阴影半径 
 var clockBorderShadowRadius = clockBorderRadius - shadowWidth + 1; 
 //时钟整数时间刻度线宽 
 var clockScaleWidth = 2; 
 //时钟整数时间刻度外半径 
 var clockScaleOuterRadius = clockBorderRadius - shadowWidth; 
 //时钟整数时间刻度内半径 
 var clockScaleInnerRadius = clockScaleOuterRadius - 20; 
 //时钟刻度颜色 
 var clockScaleColor = "Black"; 
 //时钟非整数时间处半径 
 var clockScaleMiddleRadius = clockScaleOuterRadius - 10; 
 //时钟数字半径 
 var clockNumRadius = clockBorderShadowRadius - 40; 
 //时钟数字字体 
 var clockNumFont = "25px Arial"; 
 //时钟数字颜色 
 var clockNumColor = "black"; 
 //数字日期距中心的垂直距离 
 var digitalDateMarginCenter = 50; 
 //数字日期颜色 
 var digitalDateColor = "Black"; 
 //数字日期字体 
 var digitalDateFont = "bold 18px Arial"; 
 //数字时间距中心的垂直距离 
 var digitalTimeMarginCenter = 100; 
 //数字时间颜色 
 var digitalTimeColor = "white"; 
 //数字时间背景颜色 
 var digitalTimeBGColor = "DarkSlateBlue"; 
 //数字时间字体 
 var digitalTimeFont = "bold 25px Arial"; 
 //数字时间高度的一半 
 var digitalTimeHeight = 40; 
 //数字时间分隔线宽度 
 var digitalTimeSpanLineWidth = 2; 
 //时钟中心点内圆的半径 
 var clockCenterInnerDotRadius = 7; 
 //时钟中心点内圆的颜色 
 var clockCenterInnerDotColor = "FireBrick"; 
 //时钟中心点外圆的半径 
 var clockCenterOuterDotRadius = 10; 
 //时钟中心点外圆的颜色 
 var clockCenterOuterDotColor = "Maroon"; 
 //时针线宽 
 var clockNeedleWidth = 5; 
 //时针半径 
 var clockHourNeedleRadius = clockBorderShadowRadius - 120; 
 //时针颜色 
 var clockHourNeedleColor = "DarkGreen"; 
 //分针半径 
 var clockMinuteNeedleRadius = clockBorderShadowRadius - 80; 
 //分针颜色 
 var clockMinuteNeedleColor = "DarkSlateGray"; 
 //秒针半径 
 var clockSecondNeedleRadius = clockBorderShadowRadius - 40; 
 //秒针尾部半径 
 var clockSecondNeedleBottomRadius = -20; 
 //秒针颜色 
 var clockSecondNeedleColor = "FireBrick"; 
 //画圆环 
 function strokeCircle(cx, cy, r) { ctx.beginPath(); ctx.arc(cx, cy, r, 0, doublePI); ctx.stroke(); } 
 //画圆 
 function fillCircle(cx, cy, r) { ctx.beginPath(); ctx.arc(cx, cy, r, 0, doublePI); ctx.fill(); } 
 //绘制线条 
 function strokeLine(x1, y1, x2, y2) { ctx.beginPath(); ctx.moveTo(x1, y1); ctx.lineTo(x2, y2); ctx.stroke(); } 
 //根据角度和半径计算圆上相应位置的坐标(最右侧为起始角度,顺时针方向为正) 
 function circlePos(cx, cy, theta, radius) { 
     var pos = {  x: cx + radius * Math.cos(theta),  y: cy + radius * Math.sin(theta), }; 
     return pos; 
 } 
 //在圆环上绘制刻度线 
 function strokeCircleLine(cx, cy, theta, r1, r2) { 
     var pos1 = circlePos(cx, cy, theta, r1); 
     var pos2 = circlePos(cx, cy, theta, r2); 
     strokeLine(pos1.x, pos1.y, pos2.x, pos2.y); 
 } 
 //设置默认阴影 
 function setShadow(type) { 
     ctx.lineWidth = shadowWidth; 
     ctx.shadowBlur = shadowBlur; 
     ctx.shadowOffsetX = shadowOffsetX; 
     ctx.shadowOffsetY = shadowOffsetY; 
     if(type === 1) {  
     ctx.shadowColor = shadowLightColor; 
     } else {  
     ctx.shadowColor = shadowDarkColor; 
     } 
 } 
 //取消阴影 
 function clearShadow() { 
     ctx.shadowColor = "rgba(0,0,0,0)"; 
     ctx.shadowBlur = 0; 
     ctx.shadowOffsetX = 0; 
     ctx.shadowOffsetY = 0; 
 } 
 //绘制时钟外圈的贝塞尔花纹 
 function renderBezierPattern() { 
     ctx.fillStyle = bezierPatternColor; 
     ctx.beginPath(); 
     var theta = 0; 
     //由于circlePos是顺时针方向正, 故圈也是顺时针方向 
     var beginPos = circlePos(cx, cy, theta, bezierRadius); 
     ctx.moveTo(beginPos.x, beginPos.y); 
     while(theta < doublePI) {  
     //贝塞尔曲线控制点  
     var controlTheta = theta + bezierHalfSpan;  
     var controlPos = circlePos(cx, cy, controlTheta, bezierPeakRadius);  
     //贝塞尔曲线终止点  
     var endTheta = controlTheta + bezierHalfSpan;  
     var endPos = circlePos(cx, cy, endTheta, bezierRadius);  
     ctx.quadraticCurveTo(controlPos.x, controlPos.y, endPos.x, endPos.y);  
     theta = endTheta;
     } 
     //绘制圆counterclockwise=false, 即默认是顺时针方向 
     ctx.arc(cx, cy, clockBorderRadius, 0, doublePI, true); 
     //注意: 两个相反方向的路径内部为填充范围 
     ctx.fill(); 
 } 
 //绘制时钟边框 
 function renderClockBorder() { 
     //画外框 
     ctx.strokeStyle = clockBorderColor; 
     ctx.lineWidth = clockBorderWidth; 
     strokeCircle(cx, cy, clockBorderRadius); 
     //画外框的内阴影 
     ctx.strokeStyle = shadowLightColor; 
     setShadow(1); strokeCircle(cx, cy, clockBorderShadowRadius); 
     clearShadow(); 
 } 
 //绘制时钟圆周上的数字和刻度部分 
 function renderClockNums() {  
     ctx.textAlign = "center"; 
     ctx.textBaseline = "middle"; 
     ctx.font = clockNumFont; var span = doublePI / 60; 
     for(var i = 1, radian = -halfPI + span; i <= 60; i++, radian += span) {  if(i % 5 == 0) {  
         //绘制刻度  
         ctx.strokeStyle = clockScaleColor;  
         ctx.lineWidth = clockScaleWidth;  
         strokeCircleLine(cx, cy, radian, clockScaleInnerRadius, clockScaleOuterRadius);  
         //绘制数字  
         var pos = circlePos(cx, cy, radian, clockNumRadius);  var num = i / 5;  
         ctx.fillStyle = clockNumColor;  ctx.fillText(num, pos.x, pos.y);  
         } else {  
         ctx.strokeStyle = clockScaleColor;  
         ctx.lineWidth = clockScaleWidth;  
         strokeCircleLine(cx, cy, radian, clockScaleMiddleRadius, clockScaleOuterRadius);
         } 
     } 
 } 
 //绘制数字时钟 
 function renderDigital(date) { 
     //绘制日期 
     ctx.textAlign = "center"; 
     ctx.textBaseline = "middle"; 
     ctx.font = digitalDateFont; 
     ctx.fillStyle = digitalDateColor; 
     var text = date.format("yyyy年MM月dd日 EEE"); 
     ctx.fillText(text, cx, cy + digitalDateMarginCenter); 
     //绘制时间 
     ctx.font = digitalTimeFont; text = date.format(" HH mm ss "); 
     ctx.fillStyle = digitalTimeBgColor; var textWidth = ctx.measureText(text).width; 
     var textBgX = cx - textWidth / 2; 
     var textBgY = cy + digitalTimeMarginCenter - digitalTimeHeight / 2; 
     ctx.fillRect(textBgX, textBgY, textWidth, digitalTimeHeight); 
     ctx.fillStyle = digitalTimeColor; 
     ctx.fillText(text, cx, cy + digitalTimeMarginCenter); 
     //绘制事件中间的分隔线 
     ctx.lineWidth = digitalTimeSpanLineWidth; 
     ctx.strokeStyle = digitalTimeColor; 
     var textSpan = textWidth / 6; 
     var leftLineX = cx - textSpan; 
     strokeLine(leftLineX, textBgY, leftLineX, textBgY + digitalTimeHeight); 
     var rightLineX = cx + textSpan; strokeLine(rightLineX, textBgY, rightLineX, textBgY + digitalTimeHeight); 
 } 
 //绘制时钟中心最下方红点 
 function renderClockCenterOuterDot() { 
    ctx.fillStyle = clockCenterOuterDotColor; fillCircle(cx, cy, clockCenterOuterDotRadius); 
 } 
 //绘制时钟中心最上方红点 
 function renderClockCenterInnerDot() { 
    ctx.fillStyle = clockCenterInnerDotColor; fillCircle(cx, cy, clockCenterInnerDotRadius); 
 } 
 //绘制时钟指针 
 function renderClockNeedle(date) { 
     var hourRadian = date.getHours() % 12 / 12 * doublePI - halfPI; 
     var minuteRadian = date.getMinutes() / 60 * doublePI - halfPI; 
     var secondRadian = date.getSeconds() / 60 * doublePI - halfPI; 
     setShadow(); 
     ctx.lineCap = "round"; 
     ctx.lineWidth = clockNeedleWidth; 
     ctx.strokeStyle = clockHourNeedleColor; 
     strokeCircleLine(cx, cy, hourRadian, 0, clockHourNeedleRadius); 
     ctx.strokeStyle = clockMinuteNeedleColor; 
     strokeCircleLine(cx, cy, minuteRadian, 0, clockMinuteNeedleRadius); 
     ctx.strokeStyle = clockSecondNeedleColor; 
     strokeCircleLine(cx, cy, secondRadian, clockSecondNeedleBottomRadius, clockSecondNeedleRadius); 
     ctx.lineCap = "square"; 
     clearShadow(); 
 } 
 function render(date) { 
     ctx.clearRect(0, 0, canvas.width, canvas.height); 
     renderBezierPattern(); 
     renderClockBorder(); 
     renderClockNums(); 
     renderDigital(date); 
     renderClockCenterOuterDot(); 
     renderClockNeedle(date); 
     renderClockCenterInnerDot(); 
 } 
 var lastTime = 0; 
 var audio = document.getElementById("ticktock"); 
 function loop() { 
     var date = new Date(); 
     var currentTime = date.getTime(); 
     if(currentTime - lastTime >= 1000) {  
     lastTime = currentTime;  
     //注意：这里设0非常关键，否则虽然会循环播放，但会从上一次暂停的地方开始播放，造成延迟  
     audio.currentTime = 0;  
     audio.play();  
     render(date); 
     } 
     requestAnimationFrame(loop); 
 } 
 loop(); 
 </script> 
 </body>
 </html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。

--结束END--

本文标题: JavaScript实现时钟特效

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