アニメーション呼び出しごとにイベントをバインドする理由 また、[event.which] は、マウスとキーのイベントを検出するための jQuery のクロスブラウザーの方法です。
これは役立つはずです、
フィドル
HTML:
<html>
<head>
<title>Raining dots</title>
<link href='http://fonts.googleapis.com/css?family=Give+You+Glory' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Gloria+Hallelujah' rel='stylesheet' type='text/css'>
<link rel="stylesheet" type="text/css" media="screen" href="css/style.css">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript" src="js/external.js" ></script>
</head>
<body id="bg">
</body>
</html>
ジャバスクリプト:
var Capsule = {
init: function() {
this.c1 = 256, this.c2 = 220, this.c3 = 225;
Capsule.callDots();
},
callDots: function() {
window.setInterval(function() {
Capsule.animateDots(Capsule.c1, Capsule.c2, Capsule.c3);
}, 10);
},
animateDots: function() {
var theWidth = $(window).width(),
theHeight = $(window).height(),
randomEntry = Math.ceil(Math.random() * theWidth),
preRandomDotSize = Math.ceil(Math.random() * 40),
randomDotSize = preRandomDotSize + 50;
var dotName = 'dot-' + randomEntry,
color1 = Math.ceil(Math.random() * Capsule.c1),
color2 = Math.ceil(Math.random() * Capsule.c2),
color3 = Math.ceil(Math.random() * Capsule.c3),
colors = 'rgb(' + color1 + ',' + color2 + ',' + color3 + ')';
$('<div />', {
text: '.',
id: dotName,
}).appendTo('body').addClass('theDots').css('left', randomEntry).css('font-size', randomDotSize).css('color', colors).animate({
"top": "+=" + theHeight
}, 5000, function() {});
}
};
$(document).ready(function() {
Capsule.init();
}).keypress(function(event) {
if (event.which == '13') {
Capsule.c1 += 2, Capsule.c2 += 4, Capsule.c3 += 6;
}
});
CSS:
body {
font: 14px / 1.5em 'Gloria Hallelujah', cursive;
}
.theDots{
position:absolute;
top:-50px;
left:0px;
z-index:10;
position:block;
}