js特效

代码结构

1. 引入JS

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>

2. HTML代码

	<div id="list">
		<ul>
			<li><a href="http://www.51qianduan.com//">PhP</a></li>
			<li><a href="http://www.51qianduan.com//">jQuery</a></li>
			<li><a href="http://www.51qianduan.com//">Magento</a></li>
			<li><a href="http://www.51qianduan.com//">MySql</a></li>
			<li><a href="http://www.51qianduan.com//">Js</a></li>
			<li><a href="http://www.51qianduan.com//">HTML</a></li>
			<li><a href="http://www.51qianduan.com//">CSS</a></li>
			<li><a href="http://www.51qianduan.com//">Ajax</a></li>
			<li><a href="http://www.51qianduan.com//">ThinkPHP</a></li>
			<li><a href="http://www.51qianduan.com//">Apache</a></li>
			<li><a href="http://www.51qianduan.com//">Linux</a></li>
			<li><a href="http://www.51qianduan.com//">Python</a></li>
			<li><a href="http://www.51qianduan.com//">web</a></li>
			<li><a href="http://www.51qianduan.com//">xhtml</a></li>
		</ul>
	</div>
<script type="text/javascript">
$(document).ready(function(){
	var element = $('#list a');
	var offset = 0; 
	var stepping = 0.03;
	var list = $('#list');
	var $list = $(list)
	$list.mousemove(function(e){
		var topOfList = $list.eq(0).offset().top
		var listHeight = $list.height()
		stepping = (e.clientY - topOfList) /  listHeight * 0.2 - 0.1;
	});
	for (var i = element.length - 1; i >= 0; i--){
		element[i].elemAngle = i * Math.PI * 2 / element.length;
	}
	setInterval(render, 20);
	function render(){
		for (var i = element.length - 1; i >= 0; i--){
			var angle = element[i].elemAngle + offset;
			x = 120 + Math.sin(angle) * 30;
			y = 45 + Math.cos(angle) * 40;
			size = Math.round(40 - Math.sin(angle) * 40);
			var elementCenter = $(element[i]).width() / 2;
			var leftValue = (($list.width()/2) * x / 100 - elementCenter) + "px"
			$(element[i]).css("fontSize", size + "pt");
			$(element[i]).css("opacity",size/100);
			$(element[i]).css("zIndex" ,size);
			$(element[i]).css("left" ,leftValue);
			$(element[i]).css("top", y + "%");
		}
		offset += stepping;
	}
});
</script>