指令不能通过重用不同的属性值来工作

Question

我在重用相同的指令时遇到问题。我无法在指令内外设置值 谁能帮我？非常感谢 这是代码

angular.module('customControl', []).
    directive('myDir', function($compile) {
    return {
    restrict: 'E', 
    require: '?ngModel', // get a hold of NgModelController
    scope:{
        ngModelList:'=ngModel'},
    link: function(scope, element, attrs, ngModel) {
    if(!ngModel) return; 
    var newInput = "<input ng-model = 'childModel1' ng-click = 'getItem()'>"; 
        if(attrs.multimode=='true'){
            newInput = "<input ng-model = 'childModel1' ng-click = 'getItem2()'>";
        }
        element.html(newInput);
        $compile(element.contents())(scope);
    scope.getItem2 = function() {
        var d = new Date();
       scope.childModel2 = 'item2_' + d.getYear();
       ngModel.$setViewValue(scope.childModel1);
        console.log(scope.childModel2);
        scope.ngModelList = scope.childModel2;
        console.log('list: '+scope.childModel1);
    }

    scope.getItem =function(){
       var d = new Date();
       scope.childModel1 = 'item1_' + d.getMonth();
       ngModel.$setViewValue(scope.childModel1);
       console.log(scope.childModel1);
        scope.ngModelList = scope.childModel1;
        console.log('list: '+scope.childModel1);
    }
    }
    }
    });

http://jsfiddle.net/EdSM5/16/