AngularJS密码确认noMatch无法正常工作？

angular.module('UserValidation',[]).directive('validPasswordC',function () {
    return {
        require: 'ngModel',link: function (scope,elm,attrs,ctrl) {
            ctrl.$parsers.unshift(function (viewValue,$scope) {
                var noMatch = viewValue != scope.signupForm.password.$viewValue
                ctrl.$setValidity('noMatch',!noMatch)
            })
        }
    }
});

这是html：

<div class="fieldset" ng-class="{'has-error':formData.password.$invalid && !formData.password.$pristine}">
   <label>Password</label>
   <input type="password" id="password" name="password" ng-model="formData.password" ng-minlength="8" ng-maxlength="20" ng-pattern="/(?=.*[a-z])(?=.*[A-Z])(?=.*[^a-zA-Z])/" placeholder="password" required />

   <p ng-show="signupForm.password.$error.required" class="error">*</p>
   <p ng-show="signupForm.password.$error.minlength" class="error">
      Passwords must be between 8 and 20 characters.</p>
   <p ng-show="signupForm.password.$error.pattern" class="error">
      Must contain one lower &amp; uppercase letter,and one non-alpha character (a number or a symbol.)</p>
</div>

<div class="fieldset" ng-class="{'has-error':formData.password_c.$invalid && !formData.password_c.$pristine}">
   <label for="password_c">Confirm Password</label>
   <input type="password" id="password_c" name="password_c" ng-model="formData.password_c" placeholder="confirm password" valid-password-c required />

   <p ng-show="signupForm.password_c.$error.noMatch" class="error">Passwords do not match.</span>
   <p ng-show="signupForm.password_c.$error.required" class="error">*</p>
</div>

密码的字符验证工作正常,但确认密码的“noMatch”功能不起作用.

可能是什么问题？谢谢！

（编辑：李大同）

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