반복되는 비밀번호를 확인하는 AngularJs 메소드(2가지 유형)

<label for="password">密码</label>
<input id="password" name="password" type="password" ng-model="user.password" required>
<label for="repassword">重复密码</label>
<input id="repassword" name="repassword" type="password" ng-model="repassword" required>
<span style="color:red" ng-show="user.password!=repassword">两次密码不一致</span>
<input type="submit" class="btn btn-primary btn-lg" value="SAVE" ng-disabled="submit(userForm)"/>
/*JS*/
app.controller("main",function($scope){
$scope.submit=function(ngFormController){
return ngFormController.$invalid; /*valid的取反*/
};
});

/*指令创建*/
app.directive('equals',function(){
return{
require:'ngModel',
link:function(scope,elm,attrs,ngModelCtrl){
function validateEqual(myValue){
var valid = (myValue === scope.$eval(attrs.equals));
ngModelCtrl.$setValidity('equal',valid);
return valid ? myValue : undefined;
}
ngModelCtrl.$parsers.push(validateEqual);
ngModelCtrl.$formatters.push(validateEqual);
scope.$watch(attrs.equals,function(){
ngModelCtrl.$setViewValue(ngModelCtrl.$viewValue);
})
}
}
});
<!--html-->
<label for="password">密码</label>
<input id="password" name="password" type="password" ng-model="user.password" required>
<label for="repassword">重复密码</label>
<input id="repassword" name="repassword" type="password" ng-model="repassword" <!--注意这里将要使用我自定义的指令-->equals="user.password" required>
<span style="color:red" ng-show="user.password!=repassword">两次密码不一致</span>
<input type="submit" class="btn btn-primary btn-lg" value="SAVE" ng-disabled="submit(userForm)"/>