<!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>aspxhome.com</title>
<style>
body{ font-size:12px; font-family:Verdana; line-height:1.9}
a{ display:block; border:1px solid #FF3366;}
</style>
</head>
<body>
计算了<input id="c" />次
<script>
var k = 0;
function test() {
k++;
document.getElementById('c').value = k;
return;
}
</script>
<div>
<ul>
<li><a href="11111111111111111111">22222</a></li>
<li><a href="11111111111111111111">22222</a></li>
<li><a href="11111111111111111111">22222</a></li>
<li><a href="11111111111111111111">22222</a></li>
</ul>
</div>
<script>
window.onload = function() {
var ass = document.getElementsByTagName('a');
for(var i = 0 ; i < ass.length ; i++) {
ass[i].style.setExpression('width' , 'this.offsetWidth > 750 ? test() : test()');
}
};
</script>
</body>
</html>
稍微在a上面移动鼠标就能造成上百次的计算，所以，请慎用
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