JS制作的可控制风级的雪花飘落效果

浏览数：40 / 时间：2015年06月09日

<!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>