本文实例讲述了JS实现超炫网页烟花动画效果的方法。分享给大家供大家参考。具体分析如下:
非常炫的使用JS实现的一个网页烟花燃放动画效果,能适应JS做出这样的动画来
<!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>
希望本文所述对大家的javascript程序设计有所帮助。
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