>我在互联网上找到了一个javascript时钟，很高兴学习一些测试，改变皮肤，大小等。
在这一点上，我想知道在悬停时更换皮肤的方法(样本上的黑色常规(。这对我的原始知识来说太多了((((
一些帮助？谢谢
代码笔样本
/**
* CoolClock 2.1.4
* Copyright 2010, Simon Baird
* Released under the BSD License.
*
* Display an analog clock using canvas.
* http://randomibis.com/coolclock/
*
*/
// Constructor for CoolClock objects
window.CoolClock = function(options) {
return this.init(options);
}
CoolClock.config = {
tickDelay: 1000,
longTickDelay: 15000,
defaultRadius: 85,
renderRadius: 100,
showSecs: true,
showAmPm: true,
skins:{
regular: {
outerBorder: { lineWidth: 6, radius:90, color: "orange", alpha: 1 },
smallIndicator: { lineWidth: 2, startAt: 80, endAt: 93, color: "orange", alpha: 1 },
largeIndicator: { lineWidth: 6, startAt: 70, endAt: 93, color: "orange", alpha: 1 },
hourHand: { lineWidth: 8, startAt: -2, endAt: 45, color: "black", alpha: 1 },
minuteHand: { lineWidth: 7, startAt: -1, endAt: 68, color: "black", alpha: 1 },
secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "orange", alpha: 1 },
secondDecoration: { lineWidth: 2, startAt: 0, radius: 3, fillColor: "orange", color: "red", alpha: 1 }
},
black: {
outerBorder: { lineWidth: 6, radius:90, color: "black", alpha: 1 },
smallIndicator: { lineWidth: 2, startAt: 80, endAt: 93, color: "black", alpha: 1 },
largeIndicator: { lineWidth: 6, startAt: 70, endAt: 93, color: "black", alpha: 1 },
hourHand: { lineWidth: 8, startAt: -2, endAt: 45, color: "black", alpha: 1 },
minuteHand: { lineWidth: 7, startAt: -1, endAt: 68, color: "black", alpha: 1 },
secondHand: { lineWidth: 1, startAt: -20, endAt: 85, color: "black", alpha: 1 },
secondDecoration: { lineWidth: 2, startAt: 0, radius: 3, fillColor: "black", color: "red", alpha: 1 }
},
},
// Test for IE so we can nurse excanvas in a couple of places
isIE: !!document.all,
// Will store (a reference to) each clock here, indexed by the id of the canvas element
clockTracker: {},
// For giving a unique id to coolclock canvases with no id
noIdCount: 0
};
// Define the CoolClock object's methods
CoolClock.prototype = {
// Initialise using the parameters parsed from the colon delimited class
init: function(options) {
// Parse and store the options
this.canvasId = options.canvasId;
this.skinId = options.skinId || CoolClock.config.defaultSkin;
this.displayRadius = options.displayRadius || CoolClock.config.defaultRadius;
this.showSecondHand = typeof options.showSecondHand == "boolean" ? options.showSecondHand : true;
this.gmtOffset = (options.gmtOffset != null && options.gmtOffset != '') ? parseFloat(options.gmtOffset) : null;
this.showDigital = typeof options.showDigital == "boolean" ? options.showDigital : false;
this.logClock = typeof options.logClock == "boolean" ? options.logClock : false;
this.logClockRev = typeof options.logClock == "boolean" ? options.logClockRev : false;
this.tickDelay = CoolClock.config[ this.showSecondHand ? "tickDelay" : "longTickDelay" ];
// Get the canvas element
this.canvas = document.getElementById(this.canvasId);
// Make the canvas the requested size. It's always square.
this.canvas.setAttribute("width",this.displayRadius*2);
this.canvas.setAttribute("height",this.displayRadius*2);
this.canvas.style.width = this.displayRadius*2 + "px";
this.canvas.style.height = this.displayRadius*2 + "px";
// Explain me please...?
this.renderRadius = CoolClock.config.renderRadius;
this.scale = this.displayRadius / this.renderRadius;
// Initialise canvas context
this.ctx = this.canvas.getContext("2d");
this.ctx.scale(this.scale,this.scale);
// Keep track of this object
CoolClock.config.clockTracker[this.canvasId] = this;
// Start the clock going
this.tick();
return this;
},
// Draw a circle at point x,y with params as defined in skin
fullCircleAt: function(x,y,skin) {
this.ctx.save();
this.ctx.globalAlpha = skin.alpha;
this.ctx.lineWidth = skin.lineWidth;
if (!CoolClock.config.isIE) {
this.ctx.beginPath();
}
if (CoolClock.config.isIE) {
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
}
this.ctx.arc(x, y, skin.radius, 0, 2*Math.PI, false);
if (CoolClock.config.isIE) {
// excanvas doesn't close the circle so let's fill in the tiny gap
this.ctx.arc(x, y, skin.radius, -0.1, 0.1, false);
}
if (skin.fillColor) {
this.ctx.fillStyle = skin.fillColor
this.ctx.fill();
}
else {
// XXX why not stroke and fill
this.ctx.strokeStyle = skin.color;
this.ctx.stroke();
}
this.ctx.restore();
},
// Draw some text centered vertically and horizontally
drawTextAt: function(theText,x,y) {
this.ctx.save();
this.ctx.font = '15px sans-serif';
var tSize = this.ctx.measureText(theText);
if (!tSize.height) tSize.height = 15; // no height in firefox.. :(
this.ctx.fillText(theText,x - tSize.width/2,y - tSize.height/2);
this.ctx.restore();
},
lpad2: function(num) {
return (num < 10 ? '0' : '') + num;
},
tickAngle: function(second) {
// Log algorithm by David Bradshaw
var tweak = 3; // If it's lower the one second mark looks wrong (?)
if (this.logClock) {
return second == 0 ? 0 : (Math.log(second*tweak) / Math.log(60*tweak));
}
else if (this.logClockRev) {
// Flip the seconds then flip the angle (trickiness)
second = (60 - second) % 60;
return 1.0 - (second == 0 ? 0 : (Math.log(second*tweak) / Math.log(60*tweak)));
}
else {
return second/60.0;
}
},
timeText: function(hour,min,sec) {
var c = CoolClock.config;
return '' +
(c.showAmPm ? ((hour%12)==0 ? 12 : (hour%12)) : hour) + ':' +
this.lpad2(min) +
(c.showSecs ? ':' + this.lpad2(sec) : '') +
(c.showAmPm ? (hour < 12 ? ' am' : ' pm') : '')
;
},
// Draw a radial line by rotating then drawing a straight line
// Ha ha, I think I've accidentally used Taus, (see http://tauday.com/)
radialLineAtAngle: function(angleFraction,skin) {
this.ctx.save();
this.ctx.translate(this.renderRadius,this.renderRadius);
this.ctx.rotate(Math.PI * (2.0 * angleFraction - 0.5));
this.ctx.globalAlpha = skin.alpha;
this.ctx.strokeStyle = skin.color;
this.ctx.lineWidth = skin.lineWidth;
if (CoolClock.config.isIE)
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
if (skin.radius) {
this.fullCircleAt(skin.startAt,0,skin)
}
else {
this.ctx.beginPath();
this.ctx.moveTo(skin.startAt,0)
this.ctx.lineTo(skin.endAt,0);
this.ctx.stroke();
}
this.ctx.restore();
},
render: function(hour,min,sec) {
// Get the skin
var skin = CoolClock.config.skins[this.skinId];
if (!skin) skin = CoolClock.config.skins[CoolClock.config.defaultSkin];
// Clear
this.ctx.clearRect(0,0,this.renderRadius*2,this.renderRadius*2);
// Draw the outer edge of the clock
if (skin.outerBorder)
this.fullCircleAt(this.renderRadius,this.renderRadius,skin.outerBorder);
// Draw the tick marks. Every 5th one is a big one
for (var i=0;i<60;i++) {
(i%5) && skin.smallIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.smallIndicator);
!(i%5) && skin.largeIndicator && this.radialLineAtAngle(this.tickAngle(i),skin.largeIndicator);
}
// Write the time
if (this.showDigital) {
this.drawTextAt(
this.timeText(hour,min,sec),
this.renderRadius,
this.renderRadius+this.renderRadius/2
);
}
// Draw the hands
if (skin.hourHand)
this.radialLineAtAngle(this.tickAngle(((hour%12)*5 + min/12.0)),skin.hourHand);
if (skin.minuteHand)
this.radialLineAtAngle(this.tickAngle((min + sec/60.0)),skin.minuteHand);
if (this.showSecondHand && skin.secondHand)
this.radialLineAtAngle(this.tickAngle(sec),skin.secondHand);
// Second hand decoration doesn't render right in IE so lets turn it off
if (!CoolClock.config.isIE && this.showSecondHand && skin.secondDecoration)
this.radialLineAtAngle(this.tickAngle(sec),skin.secondDecoration);
},
// Check the time and display the clock
refreshDisplay: function() {
var now = new Date();
if (this.gmtOffset != null) {
// Use GMT + gmtOffset
var offsetNow = new Date(now.valueOf() + (this.gmtOffset * 1000 * 60 * 60));
this.render(offsetNow.getUTCHours(),offsetNow.getUTCMinutes(),offsetNow.getUTCSeconds());
}
else {
// Use local time
this.render(now.getHours(),now.getMinutes(),now.getSeconds());
}
},
// Set timeout to trigger a tick in the future
nextTick: function() {
setTimeout("CoolClock.config.clockTracker['"+this.canvasId+"'].tick()",this.tickDelay);
},
// Check the canvas element hasn't been removed
stillHere: function() {
return document.getElementById(this.canvasId) != null;
},
// Main tick handler. Refresh the clock then setup the next tick
tick: function() {
if (this.stillHere()) {
this.refreshDisplay()
this.nextTick();
}
}
};
// Find all canvas elements that have the CoolClock class and turns them into clocks
CoolClock.findAndCreateClocks = function() {
// (Let's not use a jQuery selector here so it's easier to use frameworks other than jQuery)
var canvases = document.getElementsByTagName("canvas");
for (var i=0;i<canvases.length;i++) {
// Pull out the fields from the class. Example "CoolClock:chunkySwissOnBlack:1000"
var fields = canvases[i].className.split(" ")[0].split(":");
if (fields[0] == "CoolClock") {
if (!canvases[i].id) {
// If there's no id on this canvas element then give it one
canvases[i].id = '_coolclock_auto_id_' + CoolClock.config.noIdCount++;
}
// Create a clock object for this element
new CoolClock({
canvasId: canvases[i].id,
skinId: fields[1],
displayRadius: fields[2],
showSecondHand: fields[3]!='noSeconds',
gmtOffset: fields[4],
showDigital: fields[5]=='showDigital',
logClock: fields[6]=='logClock',
logClockRev: fields[6]=='logClockRev'
});
}
}
};
if (window.jQuery) jQuery(document).ready(CoolClock.findAndCreateClocks);<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="c1" class="CoolClock:regular:125"></canvas>CoolClock 通过在 canvas 元素上指定类来工作，因此您可以使用 jQuery 在悬停时更改这些类：
$(document).ready(function(){
$('#c1').hover(function() {
$(this).toggleClass('CoolClock:regular:125 CoolClock:black:125');
CoolClock.findAndCreateClocks();
}, function() {
$(this).toggleClass('CoolClock:regular:125 CoolClock:black:125');
CoolClock.findAndCreateClocks();
});
});
您会注意到，由于没有可用的刷新功能，因此必须在悬停进出时调用findAndCreateClocks()函数。
更新的代码段如下：
/**
* CoolClock 2.1.4
* Copyright 2010, Simon Baird
* Released under the BSD License.
*
* Display an analog clock using canvas.
* http://randomibis.com/coolclock/
*
*/
// Constructor for CoolClock objects
window.CoolClock = function(options) {
return this.init(options);
}
CoolClock.config = {
tickDelay: 1000,
longTickDelay: 15000,
defaultRadius: 85,
renderRadius: 100,
showSecs: true,
showAmPm: true,
skins: {
regular: {
outerBorder: {
lineWidth: 6,
radius: 90,
color: "orange",
alpha: 1
},
smallIndicator: {
lineWidth: 2,
startAt: 80,
endAt: 93,
color: "orange",
alpha: 1
},
largeIndicator: {
lineWidth: 6,
startAt: 70,
endAt: 93,
color: "orange",
alpha: 1
},
hourHand: {
lineWidth: 8,
startAt: -2,
endAt: 45,
color: "black",
alpha: 1
},
minuteHand: {
lineWidth: 7,
startAt: -1,
endAt: 68,
color: "black",
alpha: 1
},
secondHand: {
lineWidth: 1,
startAt: -20,
endAt: 85,
color: "orange",
alpha: 1
},
secondDecoration: {
lineWidth: 2,
startAt: 0,
radius: 3,
fillColor: "orange",
color: "red",
alpha: 1
}
},
black: {
outerBorder: {
lineWidth: 6,
radius: 90,
color: "black",
alpha: 1
},
smallIndicator: {
lineWidth: 2,
startAt: 80,
endAt: 93,
color: "black",
alpha: 1
},
largeIndicator: {
lineWidth: 6,
startAt: 70,
endAt: 93,
color: "black",
alpha: 1
},
hourHand: {
lineWidth: 8,
startAt: -2,
endAt: 45,
color: "black",
alpha: 1
},
minuteHand: {
lineWidth: 7,
startAt: -1,
endAt: 68,
color: "black",
alpha: 1
},
secondHand: {
lineWidth: 1,
startAt: -20,
endAt: 85,
color: "black",
alpha: 1
},
secondDecoration: {
lineWidth: 2,
startAt: 0,
radius: 3,
fillColor: "black",
color: "red",
alpha: 1
}
},
},
// Test for IE so we can nurse excanvas in a couple of places
isIE: !!document.all,
// Will store (a reference to) each clock here, indexed by the id of the canvas element
clockTracker: {},
// For giving a unique id to coolclock canvases with no id
noIdCount: 0
};
// Define the CoolClock object's methods
CoolClock.prototype = {
// Initialise using the parameters parsed from the colon delimited class
init: function(options) {
// Parse and store the options
this.canvasId = options.canvasId;
this.skinId = options.skinId || CoolClock.config.defaultSkin;
this.displayRadius = options.displayRadius || CoolClock.config.defaultRadius;
this.showSecondHand = typeof options.showSecondHand == "boolean" ? options.showSecondHand : true;
this.gmtOffset = (options.gmtOffset != null && options.gmtOffset != '') ? parseFloat(options.gmtOffset) : null;
this.showDigital = typeof options.showDigital == "boolean" ? options.showDigital : false;
this.logClock = typeof options.logClock == "boolean" ? options.logClock : false;
this.logClockRev = typeof options.logClock == "boolean" ? options.logClockRev : false;
this.tickDelay = CoolClock.config[this.showSecondHand ? "tickDelay" : "longTickDelay"];
// Get the canvas element
this.canvas = document.getElementById(this.canvasId);
// Make the canvas the requested size. It's always square.
this.canvas.setAttribute("width", this.displayRadius * 2);
this.canvas.setAttribute("height", this.displayRadius * 2);
this.canvas.style.width = this.displayRadius * 2 + "px";
this.canvas.style.height = this.displayRadius * 2 + "px";
// Explain me please...?
this.renderRadius = CoolClock.config.renderRadius;
this.scale = this.displayRadius / this.renderRadius;
// Initialise canvas context
this.ctx = this.canvas.getContext("2d");
this.ctx.scale(this.scale, this.scale);
// Keep track of this object
CoolClock.config.clockTracker[this.canvasId] = this;
// Start the clock going
this.tick();
return this;
},
// Draw a circle at point x,y with params as defined in skin
fullCircleAt: function(x, y, skin) {
this.ctx.save();
this.ctx.globalAlpha = skin.alpha;
this.ctx.lineWidth = skin.lineWidth;
if (!CoolClock.config.isIE) {
this.ctx.beginPath();
}
if (CoolClock.config.isIE) {
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
}
this.ctx.arc(x, y, skin.radius, 0, 2 * Math.PI, false);
if (CoolClock.config.isIE) {
// excanvas doesn't close the circle so let's fill in the tiny gap
this.ctx.arc(x, y, skin.radius, -0.1, 0.1, false);
}
if (skin.fillColor) {
this.ctx.fillStyle = skin.fillColor
this.ctx.fill();
} else {
// XXX why not stroke and fill
this.ctx.strokeStyle = skin.color;
this.ctx.stroke();
}
this.ctx.restore();
},
// Draw some text centered vertically and horizontally
drawTextAt: function(theText, x, y) {
this.ctx.save();
this.ctx.font = '15px sans-serif';
var tSize = this.ctx.measureText(theText);
if (!tSize.height) tSize.height = 15; // no height in firefox.. :(
this.ctx.fillText(theText, x - tSize.width / 2, y - tSize.height / 2);
this.ctx.restore();
},
lpad2: function(num) {
return (num < 10 ? '0' : '') + num;
},
tickAngle: function(second) {
// Log algorithm by David Bradshaw
var tweak = 3; // If it's lower the one second mark looks wrong (?)
if (this.logClock) {
return second == 0 ? 0 : (Math.log(second * tweak) / Math.log(60 * tweak));
} else if (this.logClockRev) {
// Flip the seconds then flip the angle (trickiness)
second = (60 - second) % 60;
return 1.0 - (second == 0 ? 0 : (Math.log(second * tweak) / Math.log(60 * tweak)));
} else {
return second / 60.0;
}
},
timeText: function(hour, min, sec) {
var c = CoolClock.config;
return '' +
(c.showAmPm ? ((hour % 12) == 0 ? 12 : (hour % 12)) : hour) + ':' +
this.lpad2(min) +
(c.showSecs ? ':' + this.lpad2(sec) : '') +
(c.showAmPm ? (hour < 12 ? ' am' : ' pm') : '');
},
// Draw a radial line by rotating then drawing a straight line
// Ha ha, I think I've accidentally used Taus, (see http://tauday.com/)
radialLineAtAngle: function(angleFraction, skin) {
this.ctx.save();
this.ctx.translate(this.renderRadius, this.renderRadius);
this.ctx.rotate(Math.PI * (2.0 * angleFraction - 0.5));
this.ctx.globalAlpha = skin.alpha;
this.ctx.strokeStyle = skin.color;
this.ctx.lineWidth = skin.lineWidth;
if (CoolClock.config.isIE)
// excanvas doesn't scale line width so we will do it here
this.ctx.lineWidth = this.ctx.lineWidth * this.scale;
if (skin.radius) {
this.fullCircleAt(skin.startAt, 0, skin)
} else {
this.ctx.beginPath();
this.ctx.moveTo(skin.startAt, 0)
this.ctx.lineTo(skin.endAt, 0);
this.ctx.stroke();
}
this.ctx.restore();
},
render: function(hour, min, sec) {
// Get the skin
var skin = CoolClock.config.skins[this.skinId];
if (!skin) skin = CoolClock.config.skins[CoolClock.config.defaultSkin];
// Clear
this.ctx.clearRect(0, 0, this.renderRadius * 2, this.renderRadius * 2);
// Draw the outer edge of the clock
if (skin.outerBorder)
this.fullCircleAt(this.renderRadius, this.renderRadius, skin.outerBorder);
// Draw the tick marks. Every 5th one is a big one
for (var i = 0; i < 60; i++) {
(i % 5) && skin.smallIndicator && this.radialLineAtAngle(this.tickAngle(i), skin.smallIndicator);
!(i % 5) && skin.largeIndicator && this.radialLineAtAngle(this.tickAngle(i), skin.largeIndicator);
}
// Write the time
if (this.showDigital) {
this.drawTextAt(
this.timeText(hour, min, sec),
this.renderRadius,
this.renderRadius + this.renderRadius / 2
);
}
// Draw the hands
if (skin.hourHand)
this.radialLineAtAngle(this.tickAngle(((hour % 12) * 5 + min / 12.0)), skin.hourHand);
if (skin.minuteHand)
this.radialLineAtAngle(this.tickAngle((min + sec / 60.0)), skin.minuteHand);
if (this.showSecondHand && skin.secondHand)
this.radialLineAtAngle(this.tickAngle(sec), skin.secondHand);
// Second hand decoration doesn't render right in IE so lets turn it off
if (!CoolClock.config.isIE && this.showSecondHand && skin.secondDecoration)
this.radialLineAtAngle(this.tickAngle(sec), skin.secondDecoration);
},
// Check the time and display the clock
refreshDisplay: function() {
var now = new Date();
if (this.gmtOffset != null) {
// Use GMT + gmtOffset
var offsetNow = new Date(now.valueOf() + (this.gmtOffset * 1000 * 60 * 60));
this.render(offsetNow.getUTCHours(), offsetNow.getUTCMinutes(), offsetNow.getUTCSeconds());
} else {
// Use local time
this.render(now.getHours(), now.getMinutes(), now.getSeconds());
}
},
// Set timeout to trigger a tick in the future
nextTick: function() {
setTimeout("CoolClock.config.clockTracker['" + this.canvasId + "'].tick()", this.tickDelay);
},
// Check the canvas element hasn't been removed
stillHere: function() {
return document.getElementById(this.canvasId) != null;
},
// Main tick handler. Refresh the clock then setup the next tick
tick: function() {
if (this.stillHere()) {
this.refreshDisplay()
this.nextTick();
}
}
};
// Find all canvas elements that have the CoolClock class and turns them into clocks
CoolClock.findAndCreateClocks = function() {
// (Let's not use a jQuery selector here so it's easier to use frameworks other than jQuery)
var canvases = document.getElementsByTagName("canvas");
for (var i = 0; i < canvases.length; i++) {
// Pull out the fields from the class. Example "CoolClock:chunkySwissOnBlack:1000"
var fields = canvases[i].className.split(" ")[0].split(":");
if (fields[0] == "CoolClock") {
if (!canvases[i].id) {
// If there's no id on this canvas element then give it one
canvases[i].id = '_coolclock_auto_id_' + CoolClock.config.noIdCount++;
}
// Create a clock object for this element
new CoolClock({
canvasId: canvases[i].id,
skinId: fields[1],
displayRadius: fields[2],
showSecondHand: fields[3] != 'noSeconds',
gmtOffset: fields[4],
showDigital: fields[5] == 'showDigital',
logClock: fields[6] == 'logClock',
logClockRev: fields[6] == 'logClockRev'
});
}
}
};
$(document).ready(CoolClock.findAndCreateClocks);
$(document).ready(function(){
$('#c1').hover(function() {
$(this).toggleClass('CoolClock:regular:125 CoolClock:black:125');
CoolClock.findAndCreateClocks();
}, function() {
$(this).toggleClass('CoolClock:regular:125 CoolClock:black:125');
CoolClock.findAndCreateClocks();
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="c1" class="CoolClock:regular:125"></canvas>