本文实例讲述了JS实现模拟风力的雪花飘落效果。分享给大家供大家参考。具体实现方法如下：
<!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><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>雪花飘啊飘</title></head><style>* {margin:0; padding:0; vertical-align:top;}.xue{position:absolute;color:#fff;}</style><body><div id="bbb" style="position:absolute;top:0px;right:0px;width:400px;border:1px #000 solid;background:#fff;z-index:9;height:30px;"></div><div id="box" style="height:600px;position:relative;border:1px red solid;background:#000;overflow:hidden;"></div><div style="position:absolute;top:0px;right:400px;border:1px #000 solid;background:#fff;width:400px;height:30px;z-index:5;"><input id="wind_id" value="10" />级风<input id="wind_button" type=button value="雪花飘啊飘飘啊飘" /></div><script>var box = document.getElementById("box");var i= 0,c,d,wind_time;var all = 0,other = 0,wind=0;box.style.width = '1000px';document.getElementById("wind_button").onclick = function(){clearTimeout(wind_time);wind = 0;wind = parseInt(document.getElementById("wind_id").value);wind_run(wind);}function gogo(){var a = document.createElement("div");a.innerHTML = '.';a.id = "xue" + i;a.className = "xue";a.style.top = parseInt(box.style.height) * (Math.random() > 0.3 ? Math.random() : 0) + 'px';if(wind != 0){var ss = Math.random() > Math.abs(wind*0.025) ? Math.random() : (wind > 0 ? 0 : 1) ;}else{var ss = Math.random()}a.style.left = parseInt(box.style.width) * ss + 'px';box.appendChild(a);godown(a.id,a.id,8*Math.random());i++;all++;var x = 100 * Math.random()* Math.random();setTimeout('gogo()',x);};function removeElement(_element){//移除标签的函数var _parentElement = _element.parentNode;if(_parentElement){_parentElement.removeChild(_element);};};function godown(a,e,speed){if(speed < 3){speed = 3}var a1 =document.getElementById(a);a1.style.top = parseInt(a1.style.top) + speed +'px';if(parseInt(a1.style.top) < parseInt(box.style.height)){e = setTimeout("godown(/""+a+"/",/""+e+"/","+speed+")",20)}else{clearTimeout(e);removeElement(a1);speed=null;other++;document.getElementById('bbb').innerHTML = "区域内还有"+(all-other)+"个雪花点."};};function wind_run(wind){var a = document.getElementById("box").getElementsByTagName('div');for(var i = 0;i<a.length;i++){a[i].style.left = parseInt(a[i].style.left) + wind +'px';};if(Math.abs(wind) > 0.1){wind_time = setTimeout("wind_run("+wind+")",20)}else{clearTimeout(wind_time);wind = 0;};};gogo();</script></body></html>希望本文所述对大家的javascript程序设计有所帮助。
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