用AngularJS来实现监察表单按钮的禁用效果

<div class="row row-form"> 
   <div class="col col-form"> 
    <div class="list"> 
     <div class="row row-code"> 
      <div class="col col-60 col-mobile"> 
       <label class="item item-input mobile-btn"> 
        <input type="text" placeholder="手机号" name="mobile_num" id="mobile_num" ng-model="mobileNum"> 
       </label> 
      </div> 
      <div class="col col-40 col-code"> 
        <input type="button" class="button button-block code-btn" id="get_num_btn" ng-click="getCode()" ng-value="info" ng-disabled="isDisabled"> 
      </div> 
     </div> 
 
     <label class="item item-input"> 
      <input type="text" placeholder="验证码" name="check_num" id="check_num" ng-model="codeNum"> 
     </label> 
     <button class="button button-block button-my-style" id="submit_btn" ng-click="submit()" ng-disabled="isSubmitted">提 交</button> 
    </div> 
   </div> 
  </div> 

 .col-form{ 
 padding: 5% 2%; 
 margin-bottom: 10%; 
} 
.col-form .list label{ 
  margin-bottom:0.2rem; 
  border-radius: 0.5rem; 
} 
.col-form .list input{ 
 font:normal 1rem fzltxhjw; 
} 
.item-my-style{ 
 padding: 0.5rem; 
} 
.row-code{ 
 padding-left: 0; 
 padding-right: 0; 
} 
.button.code-btn{ 
 margin:0; 
 border-radius: 0.5rem; 
 background-color: #ffba07; 
 color: #51110a; 
} 
.col-mobile{ 
 padding-left: 0; 
} 
.col-code{ 
 padding-right: 0; 
} 

var myApp=angular.module('myApp', ['ionic']); 
myApp.controller("FirstController",["$scope",function($scope){ 
  //监察手机号 
  $scope.isDisabled=true; 
  $scope.mobileNum=""; 
  $scope.mobileVal=function(){ 
    return $scope.mobileNum; 
  }; 
  $scope.$watch($scope.mobileVal,function(newValue,oldValue){ 
    var regex = /^(13[0-9]|14[0-9]|15[0-9]|17[0-9]|18[0-9])\d{8}$/; 
    if(regex.test(newValue)){ 
      $scope.isDisabled=false; 
    }else{ 
      $scope.isDisabled=true; 
    } 
  }); 
  //监察验证码 
  $scope.isSubmitted=true; 
  $scope.codeNum=""; 
  $scope.codeVal=function(){ 
    return $scope.codeNum; 
  }; 
  $scope.$watch($scope.codeVal,function(newValue,oldValue){ 
    if(newValue.length==4){ 
      $scope.isSubmitted=false; 
    }else{ 
      $scope.isSubmitted=true; 
    } 
  }); 
   
}]);