JSFiddle - React, Tailwind, and code Playground

HTML

<input name="chkservicecrew" value="the chkservicecrew" type="checkbox">chkservicecrew
<br>
<input name="chkservicecrew" value="chkservicecrew" type="checkbox">chkservicecrew
<br>
<input name="chkservicecrew" value="chkservicecrew" type="checkbox">chkservicecrew
<br>
<input name="chkservicecrew" value="chkservicecrew" type="checkbox">chkservicecrew
<br>

JavaScript

var maxCheckboxes = 2;

 $('input[name="chkservicecrew"]').change(function () {
     var checkedNum = $('input[name="chkservicecrew"]:checked').length;
     var allCheckoxesChecked = $('input[name="chkservicecrew"]:checked');
     var allCheckboxes = $("input[name='chkservicecrew']");

     //alert(checkedNum + " - " + maxCheckboxes);

     if (checkedNum == maxCheckboxes) {
         $(allCheckboxes).attr('disabled', 'disabled');
         $(allCheckoxesChecked).removeAttr('disabled');
     } else {
         $(allCheckboxes).removeAttr('disabled');
     }

 });