我試圖弄清楚如何檢查所有4個輸入是否都已填寫，然后選中聯(lián)系信息復(fù)選框。如果未填寫，請取消選中該復(fù)選框。任何幫助，將不勝感激。$(document).on('change', '#ContactName, #ContactEmail, #ContactPhone', function() {        if ('#ContactName, #ContactEmail, #ContactPhone' === '') {$("#contactinformation").prop("checked", false);} else {$("#contactinformation").prop("checked", true);                }<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script><div class="row">  <div class="col-lg-7">    <div class="form-group">      <label for="ContactName">Contact name:</label>      <input type="text" class="form-control input-sm" name="ContactName" id="ContactName" size="40" maxlength="120" value="" />    </div>    </div></div><div class="row">  <div class="col-lg-7">    <div class="form-group">      <label for="BusinessName">Business name:</label>      <input type="text" class="form-control input-sm" name="BusinessName" id="BusinessName" size="40" maxlength="120" value="" />    </div>    </div></div><div class="row">  <div class="col-lg-7">    <div class="form-group">      <label for="ContactEmail">Email address:</label>      <input type="text" class="form-control input-sm" name="ContactEmail" id="ContactEmail" size="40" maxlength="80" value="" />    </div>    </div></div><div class="row">  <div class="col-lg-7">    <div class="form-group">      <label for="ContactPhone">Phone number (business hours):</label>      <input type="text" class="form-control input-sm" name="ContactPhone" id="ContactPhone" size="40" maxlength="50" value="" />    </div>    </div></div><div class="row">  <div class="col-lg-12">    <div class="form-group">      <input type="checkbox" name="contactinformation" id="contactinformation" />      Contact information    </div>  </div></div>