【代码教程】JavaScript写的炫光波动效果

2013-08-18 21:22:36 -0400

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>炫光波动效果</title>
<script>
var lightWave = function(T,left,thick,sharp,speed,vibration,amplitude,opacity){
	this.cont = T;//炫光容器
	this.left = left;//炫光向右偏移量
	this.thick = thick;//粗细
	this.sharp = sharp;//尖锐度
	this.speed = speed;//波动速度
	this.vibration = vibration;//单位时间内的振动频率
	this.amplitude = amplitude;//振幅
	this.opacity = opacity;//透明度
	this.cont.style.position = 'relative';
	this.move();
}
lightWave.prototype = {
	point:function(n,l,t,c,color){
		var p = document.createElement('p');
		p.innerHTML = ' ';
		p.style.top = t + 'px';
		p.style.left = l + 'px';
		p.style.width = 1 + 'px';
		p.style.height = n + 'px';
		p.style.filter = 'alpha(opacity='+this.opacity+')';
		p.style.lineHeight = 0;
		p.style.position = 'absolute';
		p.style.background = color;
		c.appendChild(p);
		return this;
	},
	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('');
	},
	wave:function(){
		var l = this.left,t = this.wavelength,color = this.color();
		var c = document.createElement('div');
		c.style.top = this.amplitude+20+'px';
		c.style.position = 'absolute';
		c.style.opacity = this.opacity/100;
		for(var i=1;i<this.thick;i++){
			for(var j=0;j<this.thick*this.sharp-i*i;j++,l++){
				this.point(i,l,-9999,c,color);
			}
		}
		for(var i=this.thick;i>0;i--){
			for(var j=this.thick*this.sharp-i*i;j>0;j--,l++){
				this.point(i,l,-9999,c,color);
			}
		}
		this.cont.appendChild(c);
		return c;
	},
	move:function(){
		var wl = this.amplitude;
		var vibration = this.vibration;
		var w = this.wave().getElementsByTagName('p');
		for(var i=0;i<w.length;i++){
			w[i].i = i;
		}
		var m = function(){
			for(var i=0,len=w.length;i<len;i++){
				if(w[i].ori == true){
					w[i].i-=vibration;
					var top = w[i].i%180==90?0:wl*Math.cos(w[i].i*Math.PI/180);
					w[i].style.top = top+'px';
					if(parseFloat(w[i].style.top)<=-wl){
						w[i].ori = false;
					}
				}else{
					w[i].i+=vibration;
					var top = w[i].i%180==90?0:wl*Math.cos(w[i].i*Math.PI/180);
					w[i].style.top = top+'px';
					if(parseFloat(w[i].style.top)>=wl){
						w[i].ori = true;
					}
				}
			}
		}
		setInterval(m,this.speed);
	}
}
window.onload = function(){
	var targetDom = document.body;
	new lightWave(targetDom,0,3,36,120,6,20,40);
	new lightWave(targetDom,50,2,70,120,10,30,30);
}
</script>
</head>
<body style="background:#000;margin-top:100px">
</body>
</html>

代码效果：
/W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 炫光波动效果

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