socialforge/public/javascripts/wechat/directives/form_validate.js

app.directive('pwdconfirm', function(){
   return {
       require: 'ngModel',
       link: function(scope, elm, attrs, ctrl){
           ctrl.$validators.pwdconfirm = function(modelValue, viewValue) {
               return scope.user && scope.user.password == viewValue;
           }
       }
   }
});