看到flash的实现这类的动画非常的便捷，于是试图胡搞一下。全部是用dom模拟的像素点，锯齿是难免的……
这个要避免锯齿恐怕要再加一次滤镜了吧，或者用图片。
<!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>
参数：
var lightWave = function (T,left,thick,sharp,speed,vibration,amplitude,opacity){
this .cont = T; //需要添加炫光的容器
this .left = left; //炫光出生时的向右偏移量
this .thick = thick; //粗细程度
this .sharp = sharp; //尖锐程度
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();
}
大家感兴趣可以来讨论一下。
另外，还遇到个问题，上面代码中ie下面的透明度滤镜不起作用，经研究得知，改变父容器的定位会影响子节点的透明滤镜的继承。
以上所述就是本文的全部内容了，希望大家能够喜欢。
