Javascript 用于检查密码的angularjs指令已重复，不起作用

为了使AngularJS指令起作用，我遵循本教程：

在注册表单中，名为repeat password的指令检查表单中输入的两封电子邮件是否对应：

<div class="form-group" ng-class="{ 'has-success' : signupForm.confirmPassword.$valid && signupForm.confirmPassword.$dirty, 'has-error' : signupForm.confirmPassword.$invalid && signupForm.confirmPassword.$dirty }">
    <input class="form-control input-lg" type="password" name="confirmPassword" ng-model="confirmPassword" repeat-password="password" placeholder="Confirm Password" required>

    <div class="help-block text-danger my-special-animation" ng-if="signupForm.confirmPassword.$dirty"ng-messages="signupForm.confirmPassword.$error">
       <div ng-message="required">You must confirm password.</div>
       <div ng-message="repeat">Passwords do not match.</div>
    </div>
 </div>

 <button type="submit" ng-disabled="signupForm.$invalid" class="btn btn-lg btn-block btn-primary">Create Account</button>

---

我不知道它是否有用，但我使用的是AngularJS v1.3.0-beta.15和Angular-ui.router 0.2.10。

这里是fieldMatch指令的通用版本，带有对其他SO问题的注释和参考。它已经用1.2和1.3测试版进行了测试

.directive('fieldMatch', function () {
    return {
        restrict: 'A',
        scope: true,
        require: 'ngModel',
        link: function (scope, elem, attrs, ngModel) {
            var checkFieldMatch = function () {
                // WARNING - FIXME:
                // when a validator fails (returns false), then the underlying model value is set to undefined
                //
                // https://stackoverflow.com/questions/24692775
                // https://stackoverflow.com/questions/24385104
                //
                // => solution: use ngModel.$viewValue instead of ngModel.$modelValue

                var fieldMatch = scope.$eval(attrs.dsFieldMatch),
                    value = ngModel.$modelValue || ngModel.$viewValue;

                // If fieldMatch or ngModel.$viewValue is defined,
                // they should match
                if (fieldMatch || value) {
                    return fieldMatch === value;
                }
                return true;
            };

            scope.$watch(checkFieldMatch, function (n) {
                //set the form control to valid if both
                //passwords are the same, else invalid
                ngModel.$setValidity('fieldMatch', n);
            });
        }
    };
});

请参见以下两个其他问题：

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.directive('fieldMatch', function () {
    return {
        restrict: 'A',
        scope: true,
        require: 'ngModel',
        link: function (scope, elem, attrs, ngModel) {
            var checkFieldMatch = function () {
                // WARNING - FIXME:
                // when a validator fails (returns false), then the underlying model value is set to undefined
                //
                // https://stackoverflow.com/questions/24692775
                // https://stackoverflow.com/questions/24385104
                //
                // => solution: use ngModel.$viewValue instead of ngModel.$modelValue

                var fieldMatch = scope.$eval(attrs.dsFieldMatch),
                    value = ngModel.$modelValue || ngModel.$viewValue;

                // If fieldMatch or ngModel.$viewValue is defined,
                // they should match
                if (fieldMatch || value) {
                    return fieldMatch === value;
                }
                return true;
            };

            scope.$watch(checkFieldMatch, function (n) {
                //set the form control to valid if both
                //passwords are the same, else invalid
                ngModel.$setValidity('fieldMatch', n);
            });
        }
    };
});