JS实现放烟花效果

本文实例为大家分享了JS实现放烟花效果的具体代码，供大家参考，具体内容如下

 
 
 
 
 html,body{overflow:hidden;}
 body,div,p{margin:0;padding:0;}
 body{background:#000;font:12px/1.5 arial;color:#7A7A7A;}
 .fire {
 width: 3px;
 height: 30px;
 background: white;
 position: absolute;
 } 
 .spark {
 position: absolute;
 width: 6px;
 height: 6px;
 }
 
 
 
 
 
 
 

move.js

function animate(obj, json, extend){
 extend = extend || {};
 if(obj.isMoving){
 return;
 } else {
 stop();
 obj.isMoving = true;
 }
 //obj = Object.assgin(obj,extend);
 obj.buffer = extend.buffer;
 obj.callback = extend.callback;
 obj.timerlist = {};
 //为每一个属性添加一个定时器
 for(var attr in json){
 (function(attr){
 obj.timerlist[attr] = {speed:0};
 obj.timerlist[attr].timer = setInterval(function(){
 //首先得到当前值
 var iNow = 0;
 if(attr == "opacity"){
  iNow = getStyle(obj, attr) * 100; 
 } else {
  iNow = getStyle(obj, attr);
 }
 var speed = obj.timerlist[attr].speed;
 //根据目标值，计算需要的速度
 if(obj.buffer==true){
  speed += (json[attr] - iNow)/5;
  speed *= 0.75;
 } else {
  speed = (json[attr] - iNow)/5;
 }
 //当无限接近目标值时，停止定时器
 if(Math.abs(iNow - json[attr]) < 0.5){
  clearInterval(obj.timerlist[attr].timer);
  delete obj.timerlist[attr];
  if(getObjLength(obj.timerlist)==0){//所有定时器已停止
  stop();
  obj.callback ? obj.callback() : "";
  }
 } else {
  //根据速度，修改当前值
  if(attr == "opacity"){
  obj.style.opacity = (iNow+speed)/100;
  obj.style.filter = 'alpha(opacity=' + parseFloat(iNow+speed) + ')'; 
  } else {
  obj.style[attr] = iNow+speed+"px";
  }
  obj.timerlist[attr].speed = speed;
 }
 }, 30);
 })(attr);
 }
 
 function clearTimer(){
 for(var i in obj.timerlist){
 clearInterval(obj.timerlist[i]);
 }
 }
 function getStyle(obj, attr){
 if(obj.currentStyle){
 return isNaN(parseFloat(obj.currentStyle[attr])) ? obj.style[attr]=0 : parseFloat(obj.currentStyle[attr]);
 } else {
 return isNaN(parseFloat(getComputedStyle(obj, null)[attr])) ? obj.style[attr]=0 : parseFloat(getComputedStyle(obj, null)[attr]);
 }
 }
 function getObjLength(obj){
 var n = 0;
 for(var i in obj){
 n++;
 }
 return n;
 }
 function stop(){
 clearTimer();//清除所有定时器
 obj.isMoving = false;
 }
}

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