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在论坛放烟花吧,效果参看我论坛
代码如下:(放在第三方即可)- <style type="text/css">
- .ball{color:#FF0000; position:absolute; font-size:16px;}
- .star{color:#FF0000; position:absolute; font-size:4px;}
- </style>
- <script type="text/javascript">
- function Fireworks(sky, loop){
- this.sky = sky;
- this.skyWidth = document.body.clientWidth || document.documentElement.clientWidth;
- this.skyHeight= document.body.clientHeight || document.documentElement.clientHeight;
- this.x = this.y = 0;
- this.step = 20;
- this.delay = 30;
- this.stars = [];
- this.r = 10;
- this.step2 = 7;
- this.radius = 90;
- this.angle = 45;
- this.num = 16;
- this.loop = loop;
- this.degree = 2;
- this.t = 0;
- this.delt = 0;
- this.max = 30;
- this.cur = 1;
- this.points = null;
- }
- Fireworks.prototype = {
- init : function(){
- this.x = parseInt(this.skyWidth/1.3 * Math.random()) + this.skyWidth / 8;
- this.y = this.skyHeight;
- this._y = parseInt((this.skyHeight / 4) * Math.random()) + this.skyHeight / 5;
- },
- setOpacity : function(obj, p){
- if(p > 85){
- var opacity = 100 - (p - 85) * 4;
- if(document.all){
- obj.style.filter = "alpha(opacity=" + opacity + ")";
- }else{
- obj.style.MozOpacity = opacity / 100;
- }
- }
- },
- getNextPoint : function(degree, coeff, t){
- var tt = 1.0 - t;
- for(var rr = 1; rr <= degree; rr++){
- for(var i=0; i <= degree-rr; i++){
- coeff[i] = tt * coeff[i] + t * coeff[i+1];
- }
- }
- return coeff[0];
- },
- showBall : function(){
- this.ball = document.createElement("div");
- this.ball.innerHTML = "●";
- this.ball.className = "ball";
- this.ball.style.left = this.x + "px";
- this.ball.style.top = this.y + "px";
- this.sky.appendChild(this.ball);
- },
- moveBall : function(){
- var self = this;
- if(this.y > this._y){
- var p = parseInt((this.skyHeight - this.y) / (this.skyHeight - this._y)*10);
- this.y -= (this.step - p * 1.6);
- this.ball.style.fontSize = 16 - p + "px";
- this.ball.style.top = this.y + "px";
- setTimeout(function(){self.moveBall();}, this.delay);
- }else{
- this.fire();
- }
- },
- hideBall : function(){
- this.sky.removeChild(this.ball);
- this.ball = null;
- },
- showStars : function(){
- var colors = ['#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00','#FF0000','#FF00FF','#00FF00','#00FFFF','#FFFF00'];
- var n = cs = parseInt(Math.random() * colors.length / 2);
- var cc = parseInt(Math.random() * colors.length / 2);
- var colorMode = parseInt(Math.random() * 2);
- var star = Math.round(Math.random()) == 1 ? "★" : "☆";
- this.r = 10;
- this.radius = Math.round(Math.random() * 30) + 60;
- this.num = Math.round(Math.random() * 5 + 5) * 2;
- this.angle = 180 / this.num * 2;
-
- for(var i=1; i<=this.num; i++){
- this.stars[i] = document.createElement("div");
- this.stars[i].innerHTML = star;
- this.stars[i].className = "star";
- if(colorMode == 1){
- this.stars[i].style.color = colors[n];
- if(++n > cs + cc)
- n = cs;
- }else{
- this.stars[i].style.color = colors[parseInt(Math.random() * colors.length)];
- }
- this.sky.appendChild(this.stars[i]);
- }
- },
- moveStars : function(){
- var self = this;
- if(this.r < this.radius){
- var p = this.step2 - parseInt(this.r / this.radius * 5);
- p = p < 1 ? 1 : p;
- this.r += p;
- p = parseInt(this.r / this.radius * 100);
- for(var i=1; i<=this.num; i++){
- this.stars[i].style.left = this.x - Math.round(this.r * Math.sin(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
- this.stars[i].style.top = this.y - Math.round(this.r * Math.cos(Math.PI - (Math.PI / 180 * this.angle * i))) + "px";
- this.stars[i].style.fontSize = 4 + p/10 + "px";
- this.setOpacity(this.stars[i], p);
- }
- setTimeout(function(){self.moveStars();}, this.delay);
- }else{
- setTimeout(function(){self.hideStars();}, 200 * Math.random());
- }
- },
- initBezier : function(){
- var coeff_x = [];
- var coeff_y = [];
-
- this.points = [];
- this.t = 0;
- this.delt = 1.0 / this.max;
- this.cur = 1;
- var a = parseInt(Math.random() * 5) * 90;
- coeff_x[0] = this.x;
- coeff_y[0] = this.y;
- for(var i=1; i<=this.num; i++){
- coeff_x[1] = this.x + Math.sin(Math.PI - (Math.PI / 180 * this.angle * i)) * this.radius/2;
- coeff_y[1] = this.y + Math.cos(Math.PI - (Math.PI / 180 * this.angle * i)) * this.radius/2;
- coeff_x[2] = this.x + Math.sin(Math.PI - (Math.PI / 180 * (a-this.angle * i))) * this.radius;
- coeff_y[2] = this.y + Math.cos(Math.PI - (Math.PI / 180 * (a-this.angle * i))) * this.radius;
- this.points[(i-1)*2] = coeff_x.slice(0);
- this.points[(i-1)*2+1] = coeff_y.slice(0);
- }
- },
- moveStars2 : function(){
- var self = this;
- if(this.cur < this.max){
- this.t += this.delt;
- this.cur++;
- p = parseInt(this.cur / this.max * 100);
- for(var i=1; i<=this.num; i++){
- this.stars[i].style.left = this.getNextPoint(this.degree, this.points[(i-1)*2], this.t) + "px";
- this.stars[i].style.top = this.getNextPoint(this.degree, this.points[(i-1)*2+1], this.t) + "px";
- this.stars[i].style.fontSize = 4 + p/10 + "px";
- this.setOpacity(this.stars[i], p);
- }
- setTimeout(function(){self.moveStars2();}, this.delay);
- }else{
- setTimeout(function(){self.hideStars();}, 200 * Math.random());
- }
- },
- hideStars : function(){
- for(var i=1; i<=this.num; i++){
- this.sky.removeChild(this.stars[i]);
- this.stars[i] = null;
- if(this.points != null){
- delete this.points[(i-1)*2];
- delete this.points[(i-1)*2+1];
- }
- }
- if(this.points){
- delete this.points;
- }
- this.points = null;
- if(this.loop){
- this.play();
- }
- },
- fire : function(){
- this.hideBall();
- this.showStars();
-
- var effect = parseInt(Math.random() * 2) + 1;
- switch(effect){
- case 1:
- this.moveStars();
- break;
- case 2:
- this.initBezier();
- this.moveStars2();
- break;
- }
- },
- play : function(){
- this.init();
- this.showBall();
- this.moveBall();
- }
- };
- document.ready = function(){
- for(var i=0; i<5; i++)
- new Fireworks(document.body, true).play();
- };
- </script>
複製代碼 |
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