How to pass a variable to your directive?

Question

Angular

I don't understand how to pass a variable to a directive?
$scope.param = [1,2,3];
<div test test-data="param"></div>

angular.module('testApp')
.directive('test', function () {
  return {
    scope: {
      imgData: '@testData'
    },
    restrict: 'A',
    link: function (scope, element, attrs) {
      
    }
  }
})

Answer 1

$scope.param = [1,2,3];

angular.module('testApp')
.directive('test', function () {
  return {
    scope: {
      imgData: '=testData'
    },
    restrict: 'A',
    link: function (scope, element, attrs) {
      console.log(scope.testData); // params"
    }
  }
})