烟花特效4，HTML代码在线实时编辑、实时预览

            
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            <!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>超炫网页烟花效果</title>
</head>
<style type="text/css">
    .fire{
        display:block;
        overflow:hidden;
        font-size:12px;
        position:absolute;
    }
    body{
        overflow:hidden;
        background:#000;
    }
    html{
        overflow:hidden;
        background:#000;
    }
</style>
<body>
</body>
<script type="text/javascript">
var Fire = function(r, color) {
    this.radius = r || 12;
    this.color = color;
    this.xpos = 0;
    this.ypos = 0;
    this.zpos = 0;
    this.vx = 0;
    this.vy = 0;
    this.vz = 0;
    this.mass = 1;
    this.x =0;
    this.y=0;
    this.p = document.createElement("span");
    this.p.className = "fire";
    this.p.innerHTML = "*";
    this.p.style.fontSize = this.radius + "px";
    this.p.style.color = "#" + this.color;
}
Fire.prototype = {
    append: function(parent) {
    parent.appendChild(this.p);
    },
    setSize: function(scale) {
    this.p.style.fontSize = this.radius * scale + "px";
    },
    setPosition:function(x, y) {
    this.p.style.left = x + "px";
    this.p.style.top =  y + "px";
    },
    setVisible: function(b) {
    this.p.style.display = b ? "block" : "none";
    }
}
var fireworks = function() {
    var fires = new Array();
    var count = 150;
    var fl = 250;
    var vpx = 500;
    var vpy = 300;
    var gravity = .5;
    var floor = 200;
    var bounce = -.8;
    var timer;
    var wind = ((Math.floor(Math.random()*3) + 3)/10)*(Math.random()*2 - 1 > 0 ? 1 : -1)*.25;
    var wpos = 0;
    var wcount;
    return {
        init: function() {
            wcount = 50 + Math.floor(Math.random() * 100);
            for (var i=0; i<count; i++) {
                var color = 0xFF0000;
                color = (Math.random() * 0xFFFFFF).toString(16).toString().split(".")[0];
                while(color.length < 6) {
                color = "0" + color;
                }
                var fire = new Fire(12, color);
                fires.push(fire);
                fire.ypos = -100;
                fire.vz = Math.random() * 6 - 3;
                fire.vx = (Math.random()*2 - 1)*2 ;
                fire.vy = Math.random()*-15 - 15;
                fire.x = 500
                fire.y = 600;
                fire.append(document.body);
            }
            var that = this;
            timer = setInterval(function() {
                wpos++;
                if (wpos >= wcount) {
                wpos = 0;
                wcount = 50 + Math.floor(Math.random() * 100);
                wind = ((Math.floor(Math.random()*3) + 3)/10)*(Math.random()*2 - 1 > 0 ? 1 : -1)*.25;
                }
                for (var i=0;i<count; i++) {
                that.move(fires[i]);
                }
            }, 30);
        },
        move: function(fire) {
            fire.vy += gravity;
            fire.x += fire.vx;
            fire.y += fire.vy;
            fire.vx += wind;
            fire.setPosition(fire.x, fire.y);
            if (fire.x < 0 || fire.x >1000 || fire.y  < 0 || fire.y  > 600) {
                fire.vx = (Math.random()*2 - 1)*2;
                fire.vy = Math.random()*-15 - 15;
                fire.x = 500;
                fire.y = 600;
                fire.setPosition(fire.x, fire.y);
            }
        }
    }
}
fireworks().init();
</script>
</html>
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