<select disabled="disabled" id="test" >
<option> aa </option>
<option> bb </option>
</select>
<input type="button" value="启用" onclick="document.getElementById('test').disabled = false">
<option> aa </option>
<option> bb </option>
</select>
<input type="button" value="启用" onclick="document.getElementById('test').disabled = false">
JS:
mySel.disabled = false;
<option>aa</option>
<option>bb</option>
</select>
<input type="button" value="启用" onclick="document.getElementById('test').disabled =false">
<option> aa </option>
<option> bb </option>
</select>
<input type="button" value="启用" onclick="document.getElementById('test').disabled = false"> 这个就可以了!!你得触发一个事件来改变他的状态
就如上面的做法