如何復制問題：如果我在第一個“選擇”中選擇一個選項，該特定選項將隱藏在第二個“選擇”中。但是接下來，如果我在第二個“選擇”中選擇一個選項，新選擇的選項不會隱藏在第一個“選擇”中我怎樣才能做到這一點？每當我選擇某些內容時，它都應該隱藏在其他“選擇”部分中$(function() {  var sec = $('.security');  sec.change(function() {    console.log("security change!");    let currentSelect = sec.find('option:selected').val();    $('.security option').each(function() {      var self = $(this);      if (self.val() === currentSelect) {        self.hide();      } else {        self.show();      }    });  }).change();});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><div class="col-sm-6 form-group">  <label for="security-question-1"><span class="trn">Security Question</span> 1 *</label>  <select class="form-control security" id="security-question-1">    <option class="trn" disabled selected value>select a question</option>    <option class="trn" value="q1">What is the name of your first school?</option>    <option class="trn" value="q2">What is your favorite movie?</option>    <option class="trn" value="q3"> What is your mother's maiden name?</option>    <option class="trn" value="q4">What street did you grow up on?</option>  </select></div><div class="col-sm-6 form-group">  <label for="security-question-2"><span class="trn">Security Question</span> 2 *</label>  <select class="form-control security" id="security-question-2">    <option class="trn" disabled selected value>select a question</option>    <option class="trn" value="q1">What is the name of your first school?</option>    <option class="trn" value="q2">What is your favorite movie?</option>    <option class="trn" value="q3"> What is your mother's maiden name?</option>    <option class="trn" value="q4">What street did you grow up on?</option>  </select></div>