问如果选择列表'a‘中选择了“b”和“c”，如何从相同的选择列表“b”和“c”中删除选择选项？

EN

$("select").on("change", function() {
  //find all options with specific value(from the selected one) and remove(excluding self)
  $("select").not(this).find("option[value='" + this.value + "']").remove();
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
</select>
<select>
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
</select>
<select>
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
</select>
<select>
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
</select>

var elems = $('#a,#b,#c'); // cache the variable
elems.on('change', function(){ // attach a change handler
   elems.not(this) // remove the current element from the object
  .find('[option='+ $(this).val() +']') // find the option to be removed
  .remove(); // remove it
});

$("#a").on("change", function(){
    $("select").not(this).children("option:contains(" + $(this).val() + ")").remove();
});