【特效代码】漂亮的小烟花3

2014-08-14 16:50:20 +0800

演示看本页

代码

<script type="text/javascript">
var fireworks = function(){
	this.size = 20;
	this.rise();
}
fireworks.prototype = {
	color:function(){
		var c = ['0','3','6','9','c','f'];
		var t = [c[Math.floor(Math.random()*100)%6],'0','f'];
		t.sort(function(){return Math.random()>0.5?-1:1;});
		return '#'+t.join('');
	},
	aheight:function(){
		var h = document.documentElement.clientHeight-250;
		return Math.abs(Math.floor(Math.random()*h-200))+201;
	},
	firecracker:function(){
		var b = document.createElement('div');
		var w = document.documentElement.clientWidth;
		b.style.position = 'absolute';
		b.style.color = this.color();
		b.style.bottom = 0;
		b.style.left = Math.floor(Math.random()*w)+1+'px';
		document.body.appendChild(b);
		return b;
	},
	rise:function(){
		var o = this.firecracker();
		var n = this.aheight();
		var c = this.color;
		var e = this.expl;
		var s = this.size;
		var k = n;
		var m = function(){
			o.style.bottom = parseFloat(o.style.bottom)+k*0.1+'px';
			k-=k*0.1;
			if(k<2){
				clearInterval(clear);
				e(o,n,s,c);
			}
		}
		o.innerHTML = '.';
		if(parseInt(o.style.bottom)<n){
			var clear = setInterval(m,20);
		}
	},
	expl:function(o,n,s,c){
		var R=n/3,Ri=n/6,Rii=n/9;
		var r=0,ri=0,rii=0;
		for(var i=0;i<s;i++){
			var span = document.createElement('span');
			var p = document.createElement('i');
			var a = document.createElement('a');
			span.style.position = 'absolute';
			span.style.fontSize = n/10+'px';
			span.style.left = 0;
			span.style.top = 0;
			span.innerHTML = '*';
			p.style.position = 'absolute';
			p.style.left = 0;
			p.style.top = 0;
			p.innerHTML = '*';
			a.style.position = 'absolute';
			a.style.left = 0;
			a.style.top = 0;
			a.innerHTML = '*';
			o.appendChild(span);
			o.appendChild(p);
			o.appendChild(a);
		}
		function spr(){
			r += R*0.1;
			ri+= Ri*0.06;
			rii+= Rii*0.06;
			sp = o.getElementsByTagName('span');
			p = o.getElementsByTagName('i');
			a = o.getElementsByTagName('a');
			for(var i=0; i<sp.length;i++){
				sp[i].style.color = c();
				p[i].style.color = c();
				a[i].style.color = c();
				sp[i].style.left=r*Math.cos(360/s*i)+'px';
				sp[i].style.top=r*Math.sin(360/s*i)+'px';
				sp[i].style.fontSize=parseFloat(sp[i].style.fontSize)*0.96+'px';
				p[i].style.left=ri*Math.cos(360/s*i)+'px';
				p[i].style.top=ri*Math.sin(360/s*i)+'px';
				p[i].style.fontSize=parseFloat(sp[i].style.fontSize)*0.96+'px';
				a[i].style.left=rii*Math.cos(360/s*i)+'px';
				a[i].style.top=rii*Math.sin(360/s*i)+'px';
				a[i].style.fontSize=parseFloat(sp[i].style.fontSize)*0.96+'px';
			}
			R-=R*0.1;
			if(R<2){
				o.innerHTML = '';
				o.parentNode.removeChild(o);
				clearInterval(clearI);
			}
		}
		var clearI = setInterval(spr,20);
	}
}
window.onload = function(){
	function happyNewYear(){
		new fireworks();
	}
	setInterval(happyNewYear,1000);
}
</script>

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