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var tables = document.getElementsByTagName("table"); //、此處不能用ID，CLASS替代！！！
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rows = tables[i].getElementsByTagName("tr"); //此處 注意
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// rows = document.getElementsByTagName("tr"); //此處 注意
// for (var j = 0; j < rows.length; j++)
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// this.style.fontWeight = "bold";
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<style type="text/css">
td{
width: 200px;
}
</style>
</head>
<body>
<table border="1" cellspacing="0" cellpadding="0">
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
<tr>
<th>Data</th><td>Data</td><td>Data</td><td>Data</td><td>Data</td><td>Data</td>
</tr>
</table>
</body>
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