https://docs.angularjs.org/error/ngModel/numfmt?p0=sa


angular.module(‘myApp‘, []).directive(‘tagList‘, [function () {  return {    require: ‘ngModel‘,    link: function (scope, elem, attrs, ngModel) {            var toView = function (val) {        return (val || []).join(‘, ‘);      };            var toModel = function (val) {        return (val || ‘‘).split(‘,‘).map(function (v) {          return v.trim();        });      };            ngModel.$formatters.unshift(toView);      ngModel.$parsers.unshift(toModel);    }  };}]);