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JavaScript to realize the effect of colorful snowflakes falling from sky _javascript tips

Source: Internet
Author: User
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This article illustrates the way that JavaScript realizes the effect of colorful snowflakes falling from sky. Share to everyone for your reference. The specific analysis is as follows:

Let's take a look at the effect, as shown in the following illustration:

The complete source code is as follows:

Copy Code code as follows:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<title>javascript colorful snowflakes from the sky down </title>
<style type= "Text/css" >
. jb51snow{display:block; overflow:hidden; font-size:12px; Position:absolute};
Body{background: #000; margin:0px}
Html{overflow:hidden; background: #000;}
A{color:white;text-decoration:none}
. jb51title{color:red;height:140px;width:800px;margin:0px Auto;text-align:center}
</style>

<body>

<script type= "Text/javascript" >
var Yanhua = "Yanhua.jb51.net";
var Fire = function (r, color) {
This.radius = R | | 12;
This.color = Color | | "FF6600";
This.xpos = 0;
This.ypos = 0;
This.zpos = 0;
THIS.VX = 0;
This.vy = 0;
This.vz = 0;
This.mass = 1;
THIS.P = document.createelement ("span");
This.p.classname = "JB" + "51Snow";
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 = 100;
var fl = 250;
var vpx = 500;
var vpy = 300;
var gravity =. 3;
var floor = 200;
var bounce =-.8;
var timer;
return {
Init:function () {
for (var i = 0; i < count; i++) {
var color = 0xff0000;
color = (Math.random () * 0xFFFFFF). ToString (). ToString (). Split (".") [0];
while (Color.length < 6) {
color = "0" + color;
}
var fire = new Fire (color);
Fires.push (fire);
Fire.ypos =-100;
FIRE.VX = Math.random () * 6-3;
Fire.vy = Math.random () * 6-3;
Fire.vz = Math.random () * 6-3;
Fire.append (document.body);
}
var that = this;
Timer = setinterval (function () {
for (var i = 0; i < count; i++) {
That.move (Fires[i]);
}
}, 30);
},
Move:function (Fire) {
Fire.vy + = gravity;
Fire.xpos + = FIRE.VX;
Fire.ypos + = Fire.vy;
Fire.zpos + = Fire.vz;
if (Fire.ypos > Floor) {
Fire.ypos = floor;
Fire.vy *= Bounce;
}
if (Fire.zpos >-FL) {
var scale = FL/fl + fire.zpos;
Fire.setsize (scale);
Fire.setposition (VPX + fire.xpos * scale,
Vpy + fire.ypos * scale);
Fire.setvisible (TRUE);
} else {
Fire.setvisible (FALSE);
}
}
}
}
if (Yanhua = = ' yanhua.jb ' + '. ' + ' + ']
Fireworks (). Init ();

function Jb51snow () {
Window.location.reload ();
if (Yanhua = = ' Yanhua.jb ' + ' + ' + ' + ')
SetInterval (Jb51snow, 6000);
</script>

</body>

I hope this article will help you with your JavaScript programming.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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