JS实现模拟风力的雪花飘落效果

前端技术 2023/08/08 JavaScript

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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