回答編集履歴
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sample
test
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別途変数や配列で保持しておく
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# sample
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念の為sample
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```javascript
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$(function(){
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$('[name=s1]').on('change',function(){
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var s1=$(this).val();
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$('[name=s2] option').hide().filter(function(){return $(this).data("kind")==s1;}).show();
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}).trigger('change');
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});
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```
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```HTML
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<select name="s1">
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<option value="くだもの">くだもの</option>
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<option value="やさい">やさい</option>
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</select>
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<select name="s2">
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<option value="みかん" data-kind="くだもの">みかん</option>
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<option value="レモン" data-kind="くだもの">レモン</option>
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<option value="りんご" data-kind="くだもの">りんご</option>
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<option value="キュウリ" data-kind="やさい">キュウリ</option>
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<option value="ピーマン" data-kind="やさい">ピーマン</option>
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<option value="ニンジン" data-kind="やさい">ニンジン</option>
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</select>
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```
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