.js

$.ajax({url: window.location.href.toLowerCase().split('pages')[0] + "_api/web/getFileByServerRelativeUrl('" + window.location.pathname  + "')/Level",
	        headers: { "Accept": "application/json; odata=verbose" }, 
	        success: function(data) {

        	  if(data.d.Level === 1) {
                    console.log('The file is published');
              } else if (data.d.Level === 2) {
                    console.log('The file is in draft');
              } else {
                    console.log('The file is checked out!');
              }

              console.log(data.d.Level, 'data.d.Level');
	        }
	});