whenJsEngineTips:referenceError:function is not defined

change the declaration way of the specific function that you defined

<script>
  window.onload = function(){
      
      //there may occur some errors. 'referenceError:exeSelect() is not defined'
      function exeSelect(param)
      {
        console.log(param);  
      }
      
      //You can just change the above the declaration way 
      window.exeselect = function(param)
      {
        console.log(param);
      }
  }
</script>