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<select id="selectID">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
<option>12</option>
</select>
<script language="javascript" type="text/javascript">
var objSelect = document.getElementById("selectID");
var objDate = new Date();
objSelect.options[objDate.getMonth()].selected = true; //如果现在是11月getMonth()返回10,select对象的option从0开始编号
</script>