<select id="number" name="number">
<option value=""></option>
<option value="1">01</option>
<option value="2" selected="selected">02</option>
<option value="3">03</option>
<option value="4" selected="selected">04</option>
<option value="5">05</option>
</select>
<span id="clear">clear all</span>
$('#clear').click(function(){
// what should be here?
})
如何清除/删除中的所有选择select#number
?