Angularjs的My97DatePicker扩展

在angularjs中My97DatePicker构建后，用的 ng-model 在日期表单上无效

针对这一问题，写了个简单的指令如下

angular.module('app', []).directive('datepicker', function () {    return {        restrict: 'A',        require: '?ngModel',        scope: {},        link: function (scope, element, attrs, ngModel) {            if (!ngModel) return;            element.on("blur",function () {                var val = this.value;                scope.$apply(function () {                    ngModel.$setViewValue(val);                });            })        }    };});

html应用:

<input type="text" datepicker class="input Wdate"  ng-model="vm.startDate" onclick="WdatePicker({dateFmt:'yyyy-MM-dd'})" onChange="">