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<!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>Test</title>
<style type="text/css">
table tr td{ width:100px; height:20px; border:#000 1px solid;}
td span:hover{margin-top:-5px;display:block;}
</style>
</head>
<body>
<table>
<tr><td><span>chssjds</span> </td></tr>
<tr><td><span>gxyjds</span></td></tr>
<tr><td><span>tnbjds</span></td></tr>
<tr><td><span>sadf</span></td></tr>
<tr><td><span>asdf</span></td></tr>
<tr><td>asdf</td></tr>
</table>
</body>
</html>
<!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>无标题文档</title>
<style type="text/css">
tr:hover{ color:#f00}
table tr td{ width:400px; height:20px; border:#CCCCCC 1px solid;}
</style>
</head>
<body>
<table>
<tr><td>sadf </td></tr>
<tr><td>asdf</td></tr>
<tr><td>sadf</td></tr>
<tr><td>sadf</td></tr>
<tr><td>asdf</td></tr>
<tr><td>asdf</td></tr>
</table>
</body>
</html>
function out(obj) {
obj.style.color = 'black';
obj.style.fontSize = '15px';
}
function on(obj) {
obj.style.color = 'red';
obj.style.fontSize = '18px';
}
改字体大小吧 。<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<script>
function on(a){a.style.color="#f00"}
function out(a){a.style.color="#000"}
</script>
<table>
<tr onmouseover="on(this)" onmouseout="out(this)"><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td></tr>
<tr onmouseover="on(this)" onmouseout="out(this)"><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td></tr>
<tr onmouseover="on(this)" onmouseout="out(this)"><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td><td>aaaaaa</td></tr>
</table>
</body>
</html>