angularjs表单注册--两次密码验证

html

<div class="container" ng-controller="RegisterCtrl">    <form name="loginForm" ng-submit="submitForm()">        <div class="form-group" ng-class={'has-success':loginForm.username.$valid}>            <lable>用户名：</lable>            <input type="text" name="username" class="form-control" ng-model="userdata.username" ng-minlength="4" ng-maxlength="32" required>            <p class="error" ng-if="loginForm.username.$error.required &&loginForm.username.$touched">请输入用户名</p>            <p class="error" ng-if="(loginForm.username.$error.minlength||loginForm.username.$error.maxlength)&&loginForm.username.$touched">用户名应在4到32位之间</p>        </div>        <div class="form-group" ng-class={'has-success':loginForm.password.$valid}>            <lable>密码：</lable>            <input type="password" name="password" class="form-control" ng-model="userdata.password" ng-minlength="6" ng-maxlength="64" required>            <p class="error" ng-if="loginForm.password.$error.required &&loginForm.password.$touched">请输入密码</p>            <p class="error" ng-if="(loginForm.password.$error.minlength||loginForm.password.$error.maxlength)&&loginForm.password.$touched">密码应在6到64位之间</p>        </div>         <div class="form-group" ng-class={'has-success':loginForm.password.$valid}>            <lable>密码：</lable>            <input type="password" name="password2" class="form-control" ng-model="userdata.password2" compare="userdata.password" ng-minlength="6" ng-maxlength="64" required>             <p class="error" ng-if="loginForm.password2.$error.required &&loginForm.password2.$touched">请输入密码</p>             <p class="error" ng-if="(loginForm.password2.$error.minlength||loginForm.password2.$error.maxlength)&&loginForm.password2.$touched">密码应在6到64位之间</p>            <p class="error" ng-if="loginForm.password2.$error.compare &&loginForm.password2.$dirty">两次密码不一致</p>        </div>        <button class="btn btn-primary">注册</button>    </form></div>

js
第一种写法

.controller('RegisterCtrl', function($scope) {         $scope.userdata = {};        $scope.submitForm = function() {            console.log($scope.userdata);            if ($scope.loginForm.$invalid) {                alert('请检查您的信息')            } else {                alert('注册成功！')            }        }   })   .directive('compare', function() {        var o = {};        o.strict = 'AE';        o.scope = {            orgText: '=compare'        }        o.require = 'ngModel';        o.link = function(scope, elem, att, con) {            con.$validators.compare = function(v) {                return v == scope.orgText;            }            scope.$watch('orgText', function() {                con.$validate();            });        }        return o;    });

第二种写法

    .directive('compare',function(){        return{             strict:'AE',            require:'ngModel',            scope:{                orgText:'=compare'            },            link:function(scope,elemt,attars,con){                con.$validators.compare = function(v) {                return v == scope.orgText;            }            scope.$watch('orgText', function() {                con.$validate();            });            }        }    });