不用jQuery也来做动画

不用jQuery也来做动画

Submitted by koyoz on 2010, March 30, 15:42 PM. javascript

jQuery 框架用的人越来越多了, 无论是性能还是功能强大都不用多说.

不过随着新版本的升级, 体积也慢慢变大了.

24KB, Minified and Gzipped 155KB, Uncompressed Code

压缩并gzip输出24K, 也不小了.

如果页面上一个简单的效果,一个简单的动画就没必要载入这么大的库.

看下面这个图片渐变效果, 其实纯js不到20行就可以搞定了.

HTML代码

body {padding:0; margin:0;}
#main {margin: 50px auto;border: 1px solid #ccc;width:700px}
#main img {padding:0 20px; border:none; display:none}</style>
<div id="main"><img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /> <img alt="" width="300" height="60" src="http://www.koyoz.com/lib/img/logo.gif" /></div>
<script type="text/javascript">
(function() {
	var imgs = document.getElementById('main').getElementsByTagName('img'),
	len = imgs.length,
	i = 0;
	(function() {		
		var deep = 0,
			j = i++,
			timer = setInterval(function() {				
				imgs[j].style.opacity = deep;
				imgs[j].style.filter = "alpha(opacity=" + deep * 100 + ")";
				imgs[j].style.display = 'inline';
				deep += 0.1;
				deep >= 1 && clearInterval(timer);
		}, 60);
		if (i >= len) return;
		setTimeout(arguments.callee, 1000);
	})();
})();
</script>

提示：可以先修改部分代码后再运行

JavaScript代码