Question

我有两个名为Class1和Class2的课程。

我如何在Class1中使用Class2中的函数？

Answer 1

要从类访问函数，您需要通过new关键字创建它的实例（除非函数为static）。可以在 Class2中创建此实例：

public class Class2 { // The property holding your instance is defined here so you can access // it within any method of this class, as this is defined at class-level // rather than within a function (like the constructor). private var class1:Class1; /** * Class2's constructor. * (Called automatically when an instance of Class2 is created). */ public function Class2() { // Create an instance of Class1 and assign it to the class-level // property "class1" (defined above). class1 = new Class1(); // You can call methods of Class1 now, via class1. class1.someMethod(); } }

Answer 2

有很多不同的方法可以做到这一点。

直接在类

上调用方法

的Class1

class Class1{
     public function Class1(){
          var class2:Class2 = new Class2(); //create a new Class2 object
          class2.CallMe(); //call the CallMe function on Class2, note the . to indicate CallMe is a property of Class2
     }

 }

的Class2

class Class2{
     public function Class2(){ //class 2 constructor. This is always called when you create a new Object()

     }

     public function CallMe():void{ //note this function is public
         trace("I'm class 2");
     }

 }

将ref传递给另一个类的函数

的Class1

class Class1{
     public function Class1(){
          var class2:Class2 = new Class2(this.CallBack); //create a new Class2 object
          //note I didn't add () to the end of CallBack, I just used the function name
     }

    private function CallBack(aString:String):void{ //note we can use private here
         trace(aString) //I'm from Class2
  }

 }

的Class2

class Class2{
     public function Class2(aFunction:Function){ //class 2 constructor. Here we an accept the function
          aFunction("I'm from Class2"); //note I can pass a string back to class1
     }

 }

您还可以在超类

上扩展类和调用方法

的Class1

class Class1 extends Class2{
     public function Class1(){
        super.CallFromClass(); //I'm super
     }

 }

的Class2

class Class2{
     public function Class1(){

     }

    public function CallFromClass():void{
        trace("I'm super");
   }

 }

请查看此链接以进一步阅读： http://www.adobe.com/devnet/actionscript/articles/oop_as3.html

Answer 3

// Main.as
package {

    public class Main() {
        public function Main() {
        }

        public function hello():void {
            trace("Hello from class Main"):
        }
    }
}

//Hi.as
package {
    public class Hi() {

        private var _main:Main;

        public function Hi() {
        }

        public function fromMain():void {
            _main = new Main();    //initialize an object of class Main()
            _main.hello();    //call methods
        }
    }
}

Answer 4

如果function/property的{{1}}'可见'，则可以从Class2拨打Class1的{{1}}。对类的属性/方法的访问权限由特定属性控制，该属性可以包含以下值：function/property检查this。

然后，如果它是“可见的”，你需要的只是引用类（访问Class1属性/方法）或类的实例（访问internal (default),private,public,protected,...属性/方法）

如何使用Actionscript 3中不同类的函数

4 个答案: