Php ofvar nux=$（'#unitcount'）.text（）它只是varnux=$（'#unitcount'）然后在下面的比较中，它变为max.text（） <select name="form[norequnit][]" id="norequn

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var nux=$（'#unitcount'）.text（）它只是
varnux=$（'#unitcount'）然后在下面的比较中，它变为
max.text（）
<select name="form[norequnit][]" id="norequnit" class="rsform-select-box">
  <option value="">...</option>
  <option value="1">1</option>
  <option value="2">2</option>
  <option value="3">3</option>
  <option value="4">4</option>
  <option value="5">5</option>
  <option value="6">6</option>
</select>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>01</label>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>02</label>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>03</label>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>04</label>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>05</label>
<input name="chk" type="checkbox" class="bd-lable"  value="9432"><label>06</label>

<script type="text/javascript">
 jQuery(document).ready(function($) {

 $("#norequnit").on("change", function () {
 $('#unitcount').html($(this).find('option:selected').text());
 });

 $( document ).ajaxComplete(function() {

     $( ".log" ).text( "Triggered ajaxComplete handler." );

        var nux = $('#unitcount').text();

        $("input[name=chk]").change(function(){

    var max= nux;

    if( $("input[name=chk]:checked").length == max )
        {
            $("input[name=chk]").attr('disabled', 'disabled');
            $("input[name=chk]:checked").removeAttr('disabled');
        }           
        else{
            $("input[name=chk]").removeAttr('disabled');
            }
        })
   });

   });
  </script>

var nux; // 1. This will hold the value of nux for use in your script

$("#norequnit").on("change", function () {
    nux = $(this).val(); // 1. Save the data, 2. Use using val()
    $('#unitcount').html(nux); // 1. Use the data
});

// Assuming you've got your ajax call somewhere else, use the "success" 
// handler instead of the "ajaxComplete" function

$.ajax({
    url: yourUrl,
    method: 'get',
    data: {
        param1: 'value1',
        param2: 'value2', // etc
    },
    success: function(html) {
        // Presumably this is the HTML for your checkboxes, so add them
        // to the DOM
        $('#norequnit').after(html);

        // And the only thing that really should go here otherwise is
        // your bit of debug logging
        console.log("Triggered ajax success handler.");
    }
});

console.log("Triggered ajaxComplete handler.");

$(document).on('change', 'input[name="chk"]', function() {
    // Handler code here
});

 jQuery(document).ready(function($) {
     var nux;

     $("#norequnit").on("change", function () {
        nux = $(this).val();
        $('#unitcount').html(nux);
     });

     $.ajax({
         url: yourUrl,
         method: 'get',
         data: {
             param1: 'value1',
             param2: 'value2', // etc
         },
         success: function(html) {
             $('#norequnit').after(html);
             console.log("Triggered ajax success handler.");
         }                
     });

     $(document).on("change", 'input[name="chk"]', function() {
         if ($('input[name="chk"]:checked').length == nux) {
             $('input[name="chk"]').attr('disabled', 'disabled');
             $('input[name="chk"]:checked').removeAttr('disabled');

             // Alternatively you could do this:
             $('input[name="chk"]').not(':checked').attr('disabled', true);
         } else {
             $("input[name=chk]").removeAttr('disabled');
         }
     });
});