1 <option value="1" selected>1</option>2 <option value="1">1</option>
<script language="javascript"> selectId.selectedIndex=1;</script>3 <option value="1">1</option>
<script language="javascript"> selectId.value="1";</script>
<script language="javascript"> selectId.selectedIndex=1;</script>3 <option value="1">1</option>
<script language="javascript"> selectId.value="1";</script>
解决方案 »
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