回答編集履歴
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追記
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CHANGED
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@@ -1 +1,81 @@
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そもそもselectのoptionの背景カラーは任意に指定できないのでは？
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# 追記
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つまり、selectの2番め以降のoptionが選ばれた時に色を変えるということでしょうか？
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```javascript
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<style>
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.sl{background-Color:red;}
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</style>
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
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<script>
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$(function(){
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$.each([{id:'#year',start:1,end:64},{id:'#month',start:1,end:12},{id:'#day',start:1,end:31}],function($x,$y){
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for (var $i = $y["start"]; $i <=$y["end"] ; $i++){
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var $num = ('0' + $i).slice(-2);
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$($y["id"]).append($('<option>').val($i).text($num));
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}
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});
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$('select').on('change',function(){
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console.log($(this).prop('selectedIndex')>0);
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$(this).toggleClass("sl",$(this).prop('selectedIndex')>0);
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});
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});
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</script>
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<label>
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<select id="year">
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<option value="" selected>----</option>
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</select>
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</labe>
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<label>
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<select id="month">
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<option value="" selected>----</option>
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</select>
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</labe>
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<label>
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<select id="day">
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<option value="" selected>----</option>
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</select>
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</labe>
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```
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