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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>JS制作的可控制风级的雪花飘落效果|kiddy安全座椅丨河北运动地板</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:400px;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> <br /> </body> </html> <br><hr>
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原文地址：http://www.cnblogs.com/youtianxia/p/4398853.html
