解析現象：
input：text特性時，
預設情況下：
1.firefox高度height為16px；IE下高度為14px;
2.字型大小為：13.3333px；
3.input存在padding值：Firefox為：padding：1px 0；IE下為：padding：1px 0 3px 0；
解決執行個體：如下代碼：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
<style type="text/css">
body {
font-family:"宋體";
font-size:12px;
}
table {
border-collapse:collapse;
border:solid red 1px;
}
td,th {
border:solid red 1px;
height:40px;
}
label {
vertical-align:middle;
}
.inputtxt {
width:200px;
padding:0;
font-family:"宋體";
font-size:12px;
height:15px;
line-height:15px;
vertical-align:middle;
border:solid #0000FF 1px;
}
</style>
</head>
<body>
<form action="#" method="post">
<table>
<tr>
<th width="44">firt</th>
<td ><input name="aj" type="text" maxlength="6" class="inputtxt" />
<label>知</label>
<input type="text" maxlength="6" class="inputtxt" /></td>
</tr>
<tr>
<th>second</th>
<td>
<input name="bs" type="text" maxlength="6" class="inputtxt" /></td>
</tr>
</table>
</form>
</body>
</html>
這種情況下IE和firefox都一樣了如：
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