AngularJS 异步解决实现方法

$scope.submit=function(){ 
  userService.login($scope.user.loginname.value,$scope.user.password.value,function(data){ 
    if(data.success){ 
      location.href = '../../views/main/index.html'; 
    }else{ 
      $scope.user.error.tip=data.msg; 
    } 
  }); 
}; 

return { 
    http:$http, 
  token:'', 
  auth:[], 
  loginname:'', 
  login:function(loginname,password,fn){ 
     this.http({ 
    url:'../../scripts/loginModule/services/loginOKTest.js', 
    method:'GET' 
     }) 
     .success(function(data){ 
     if(data[0].success){ 
       ... 
           //调用回调方法 
           fn(data[0]); 
     } 
      }) 
     .error(function(data,header,config,status){ 
    alert("验证服务请求失败！"); 
     }); 
  } 
} 

//通过categoryService异步取数据 
categoryService.initCategory(loginname,token,function(category){ 
    $scope.category=category; 
    $scope.$broadcast("categoryLoaded"); 
}); 

initCategory:function(loginname,token,fn){ 
  this.http({ 
  url:'../../scripts/mainModule/services/mainCategory.js', 
  method:'GET' 
  }).success(function(data,header,config,status){ 
    fn(data); 
    }).error(function(data,header,config,status){ 
    alert("验证服务请求失败！"); 
  }); 
} 

 link:function ($scope, $elem, attrs) { 
   $scope.$on("categoryLoaded", function (event, args) { 
      //$scope.category即为异步获取的数据 
   } 
} 

$scope.replay=function(id){ 
  console.log("click replay id:"+id); 
  clearReply(); 
  //通过$rootScope广播消息给app.dialog模块的controller 
  $rootScope.$emit("openTemplate","reply.html"); 
}; 

$rootScope.$on('openTemplate',function(event, toState, toParams, fromState, fromParams){ 
    $scope.openTemplate(toState); 
}); 
     
$scope.openTemplate = function (url) { 
    if(!url) 
      url="/ZVideo-MVC/dialog/defaultTemplate.html"; 
    $scope.value = true; 
    ngDialog.open({ 
      template: url, 
      className: 'ngdialog-theme-plain', 
      scope: $scope 
    }); 
};