本文實例講述了JS實現模擬風力的雪花飄落效果。分享給大家供大家參考。具體實現方法如下：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 <!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>雪花飄啊飄</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" />級風 <input id="wind_button" type=button value="雪花飄啊飄飄啊飄" /> </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){//移除標簽的函數 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 = "區域內還有"+(all-other)+"個雪花點." }; }; 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>希望本文所述對大家的javascript程序設計有所幫助。