我有画布
（仅限Chrome浏览器）
$(function() {
var Fire = function(){
this.canvas = document.getElementById('fire');
this.ctx = this.canvas.getContext('2d');
this.canvas.height = window.innerHeight;
this.canvas.width = window.innerWidth;
this.aFires = [];
this.aSpark = [];
this.aSpark2 = [];
this.mouse = {
x : this.canvas.width * .5,
y : this.canvas.height * .75,
}
this.init();
}
Fire.prototype.init = function()
{
//this.canvas.addEventListener('mousemove', this.updateMouse.bind( this ), false);
}
Fire.prototype.run = function(){
this.update();
this.draw();
if( this.bRuning )
requestAnimationFrame( this.run.bind( this ) );
}
Fire.prototype.start = function(){
this.bRuning = true;
this.run();
}
Fire.prototype.update = function(){
this.aFires.push( new Flame( this.mouse ) );
this.aSpark.push( new Spark( this.mouse ) );
this.aSpark2.push( new Spark( this.mouse ) );
for (var i = this.aFires.length - 1; i >= 0; i--) {
if( this.aFires[i].alive )
this.aFires[i].update();
else
this.aFires.splice( i, 1 );
}
for (var i = this.aSpark.length - 1; i >= 0; i--) {
if( this.aSpark[i].alive )
this.aSpark[i].update();
else
this.aSpark.splice( i, 1 );
}
for (var i = this.aSpark2.length - 1; i >= 0; i--) {
if( this.aSpark2[i].alive )
this.aSpark2[i].update();
else
this.aSpark2.splice( i, 1 );
}
}
Fire.prototype.draw = function(){
this.ctx.globalCompositeOperation = "source-over";
this.ctx.fillStyle = "rgba( 15, 5, 2, 1 )";
this.ctx.fillRect( 0, 0, window.innerWidth, window.innerHeight );
this.grd = this.ctx.createRadialGradient( this.mouse.x, this.mouse.y - 200,200,this.mouse.x, this.mouse.y - 100,0 );
this.grd.addColorStop(0,"rgb( 15, 5, 2 )");
this.grd.addColorStop(1,"rgb(30, 10, 2 )");
this.ctx.beginPath();
this.ctx.arc( this.mouse.x, this.mouse.y - 100, 200, 0, 2*Math.PI );
this.ctx.fillStyle= this.grd;
this.ctx.fill();
this.ctx.globalCompositeOperation = "overlay";//or lighter or soft-light
for (var i = this.aFires.length - 1; i >= 0; i--) {
this.aFires[i].draw( this.ctx );
}
this.ctx.globalCompositeOperation = "soft-light";//"soft-light";//"color-dodge";
for (var i = this.aSpark.length - 1; i >= 0; i--) {
if( ( i % 2 ) === 0 )
this.aSpark[i].draw( this.ctx );
}
this.ctx.globalCompositeOperation = "color-dodge";//"soft-light";//"color-dodge";
for (var i = this.aSpark2.length - 1; i >= 0; i--) {
this.aSpark2[i].draw( this.ctx );
}
}
// Flame
var Flame = function( mouse ){
this.cx = mouse.x;
this.cy = mouse.y;
this.x = rand( this.cx - 600, this.cx + 600);
this.y = rand( this.cy - -200, this.cy + 5);
this.vy = rand( 1, 3 );
this.vx = rand( -1, 1 );
this.r = rand( 20, 30 );
this.life = rand( 3, 6 );
this.alive = true;
this.c = {
h : Math.floor( rand( 2, 40) ),
s : 1000,
l : rand( 80, 100 ),
a : 0,
ta : rand( 0.8, 0.9 )
}
}
Flame.prototype.update = function()
{
this.y -= this.vy;
this.vy += 0.05;
this.x += this.vx;
if( this.x < this.cx )
this.vx += 0.1;
else
this.vx -= 0.1;
if( this.r > 0 )
this.r -= 0.1;
if( this.r <= 0 )
this.r = 0;
this.life -= 0.15;
if( this.life <= 0 ){
this.c.a -= 0.05;
if( this.c.a <= 0 )
this.alive = false;
}else if( this.life > 0 && this.c.a < this.c.ta ){
this.c.a += .08;
}
}
Flame.prototype.draw = function( ctx ){
ctx.beginPath();
ctx.arc( this.x, this.y, this.r * 3, 0, 2*Math.PI );
ctx.fillStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + (this.c.a/20) + ")";
ctx.fill();
ctx.beginPath();
ctx.arc( this.x, this.y, this.r, 0, 2*Math.PI );
ctx.fillStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + this.c.a + ")";
ctx.fill();
}
// Spark
var Spark = function( mouse ){
this.cx = mouse.x;
this.cy = mouse.y;
this.x = rand( this.cx -600, this.cx + 600);
this.y = rand( this.cy - -200, this.cy + 5);
this.lx = this.x;
this.ly = this.y;
<!-- Edit Value -->
this.vy = rand( 1, 3 );
this.vx = rand( -4, 4 );
this.r = rand( 0, 1 );
this.life = rand( 4, 5 );
this.alive = true;
this.c = {
h : Math.floor( rand( 2, 40) ),
s : 100,
l : rand( 40, 100 ),
a : rand( 0.8, 0.9 )
}
}
Spark.prototype.update = function()
{
this.lx = this.x;
this.ly = this.y;
this.y -= this.vy;
this.x += this.vx;
if( this.x < this.cx )
this.vx += 0.2;
else
this.vx -= 0.2;
this.vy += 0.08;
this.life -= 0.1;
if( this.life <= 0 ){
this.c.a -= 0.05;
if( this.c.a <= 0 )
this.alive = false;
}
}
Spark.prototype.draw = function( ctx ){
ctx.beginPath();
ctx.moveTo( this.lx , this.ly);
ctx.lineTo( this.x, this.y);
ctx.strokeStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + (this.c.a / 2) + ")";
ctx.lineWidth = this.r * 2;
ctx.lineCap = 'round';
ctx.stroke();
ctx.closePath();
ctx.beginPath();
ctx.moveTo( this.lx , this.ly);
ctx.lineTo( this.x, this.y);
ctx.strokeStyle = "hsla( " + this.c.h + ", " + this.c.s + "%, " + this.c.l + "%, " + this.c.a + ")";
ctx.lineWidth = this.r;
ctx.stroke();
ctx.closePath();
}
rand = function( min, max ){ return Math.random() * ( max - min) + min; };
onresize = function () { oCanvas.canvas.width = window.innerWidth; oCanvas.canvas.height = window.innerHeight; };
var oCanvas;
init = function()
{
oCanvas = new Fire();
oCanvas.start();
}
window.onload = init;
});h1
{
position:relative;
z-index:1;
float:right;
width:100%;
color:#fff;
}
#fire
{
position:fixed;
height:100%;
top:0;
right:0;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script>
<canvas id="fire"></canvas>
<h1>Hover Me!</h1>
我想每次悬停我时改变画布的数量！徘徊。
例如，这个值是this.vy = rand（1,3）;这个值this.vy = rand（1,30）;当悬停改变时。
需要注意的另一件事是Mozilla浏览器极难执行，并且不支持Internet Explorer中的颜色。
请帮助我！