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JavaScript ²Ù×÷ select

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op.value=Öµ;
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var sel=document.getElementById("typelist");
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JavaScript Ìí¼Óɾ³ý checkbox

<html>
<body>
<table width="200" border="1" id="tb">
<tr id="r1">
<td><input type="checkbox" name="ck" value="1"></td>
<td>abc</td>
</tr>
</table>
<p>
<input type="button" onClick="add();" value="add"/> ......

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