日期:2014-05-16 浏览次数:20418 次
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
body { margin:0; padding:0; }
ul,li { margin:0; padding:0; }
ul { list-style:none; }
ul li { float:left; display:inline; width:100px; height:100px; line-height:100px; text-align:center; margin:0 2px; border:1px solid #000; background-color:red; }
ul li { opacity:0; }
ul li.li-a { opacity:1; }
</style>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js'></script>
<script type='text/javascript'>
function fns() {
var timer;
var lis = document.getElementById('content').getElementsByTagName('li');
var obja = document.getElementById('content').getElementsByTagName('li')[3];
var objb = document.getElementById('content').getElementsByTagName('li')[0];
for(var i=0; i<3; i++) {
lis[i].style.opacity = 0;
}
obja.style.opacity = 1;
obja.onclick = function() {
timer = setInterval(function() {
for(var i=0; i<3; i++) {
var opacity = parseFloat(lis[i].style.opacity);
opacity = opacity + 0.01;
lis[i].style.opacity = opacity;
if(lis[i].style.opacity == 1) {
clearInterval(timer);
}
}
}, 100);
}
objb.onclick = function() {
clearInterval(timer);
timer = setInterval(function() {
for(var i=1; i<4; i++) {
var opacity = parseFloat(lis[i].style.opacity);
opacity = opacity - 0.01;
lis[i].style.opacity = opacity;
if(lis[i].style.opacity < 0) {
clearInterval(timer);
}
}
}, 100);
}
}
window.onload = function() {
fns();
}
</script>
</head>
<body>
<div id='content'>
<ul>
<li>B</li>
<li>C</li>
<li>D</li>
<li class='li-a'>A</li>
</ul>
</div>
</body>
</html>