如何在flash AS3中使用未知数量的参数动态调用方法?
我有一个对象MyTester,它有另一个类MyClass的实例, 我想通过它来测试MyClass API:如何在flash AS3中使用未知数量的参数动态调用方法?,flash,actionscript-3,oop,Flash,Actionscript 3,Oop,我有一个对象MyTester,它有另一个类MyClass的实例, 我想通过它来测试MyClass API: public class MyTester { internal var myObj:MyClass; public function MyTester() { this.myObj = new MyClass(); trace(this.MyClassTestAPI("Foo", "arg1", arg2)); // tests fun
public class MyTester {
internal var myObj:MyClass;
public function MyTester() {
this.myObj = new MyClass();
trace(this.MyClassTestAPI("Foo", "arg1", arg2)); // tests function Foo(arg1:String, arg2:Number):String
trace(this.MyClassTestAPI("MyProperty")); // tests function get MyProperty():String
trace(this.MyClassTestAPI("MyProperty", "new value"));// tests function set MyProperty(val:String):void
}
public function MyClassTestAPI(functionName:String, ...rest):* {
var value:*;
try {
if (typeof(this.mediaPlayer[functionName]) == 'function') {
switch(rest.length) {
case 0:
value = myObj[functionName].call(functionName);
break;
case 1:
value = myObj[functionName].call(functionName, rest[0]);
break;
case 2:
value = myObj[functionName].call(functionName, rest[0],rest[1]);
break;
default:
throw("Cannot pass more than 2 parameters (passed " + rest.length + ")");
}
} else {
switch(rest.length) {
case 0:
value = myObj[functionName];
break;
case 1:
myObj[functionName] = rest[0];
break;
default:
throw("Cannot pass parameter to getter or more than one parameter to setter (passed " + rest.length + ")");
}
}
}
return value;
}
}
如何取消开关并使其适用于任意数量的参数?
谢谢 使用
函数.apply()
方法。它与调用
类似,但是您可以将参数作为数组
传递。比如:
function doCall( callback:Function, ... args ):void
{
// args is now an array
callback.apply( null, args );
}
// call it like this
this.doCall( this._myFunc1, 1.0 );
this.doCall( this._myFunc2, 1.0, 2.0 );
this.doCall( this._myFunc3, 1.0, 2.0, "hello" );
// to call these functions
private function _myFunc1( num:Number ):void {}
private function _myFunc2( num:Number, num2:Number ):void {}
private function _myFunc3( num:Number, num2:Number, msg:String ):void {}
()