haxe-openfl基础篇，从as3 到haxe语法转变

破晓

基础类型AS3
AS3
Boolean
int
Number
Object
void
Array
Vector.<String>
Haxe
Bool
Int
Float
Dynamic
Void
Array<Dynamic>
Array<String>

---

包的写法
AS3

1. package com.example.myapplication {
   
2. 
   
3. }

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Haxe

1. package com.example.myapplication;

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---

定义类

AS3

1. public class MyClass {
   
2. 
   
3.    public function MyClass () {
   
4. 
   
5. 
   
6.    }
   
7. 
   
8. }

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Haxe

1. class MyClass {
   
2. 
   
3.    public function new () {
   
4. 
   
5. 
   
6.    }
   
7. 
   
8. }
   

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---

for 循环

AS3

1. for (var i:uint = 0; i < 100; i++) {
   
2. 
   
3. }
   
4. 
   
5. for each (var value:String in items) {
   
6. 
   
7. }
   
8. 
   
9. for (var propertyName:String in object) {
   
10. 
    
11. }

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Haxe

1. for (i in 0...100) {
   
2. 
   
3. }
   
4. 
   
5. for (value in items) {
   
6. 
   
7. }
   
8. 
   
9. var fields = Reflect.fields (object);
   
10. for (propertyName in fields) {
    
11. 
    
12. }

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---

Switch 循环

AS3

1. switch (value) {
   
2. 
   
3.    case 1:
   
4.       trace ("Equal to 1");
   
5.       break;
   
6. 
   
7.    default:
   
8.       trace ("Not equal to 1");
   
9.       break;
   
10. 
    
11. }

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Haxe

1. switch (value) {
   
2. 
   
3.    case 1:
   
4.       trace ("Equal to 1");
   
5. 
   
6.    default:
   
7.       trace ("Not equal to 1");
   
8. 
   
9. }

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---

类型推理

AS3

1. var hi = "Hello World";
   
2. 
   
3. // type is Object
   
4. // fails to compile in strict mode

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Haxe

1. var hi = "Hello World";
   
2. 
   
3. // type is String
   
4. // even works for code completion

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---

类型转换

AS3

1. var car:Car = vehicle as Car;
   
2. 
   
3. var toString:String = String (10);
   
4. var toNumber:Number = Number ("10");
   
5. var toInteger:int = int (10.1);

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Haxe

1. var car:Car = cast vehicle;
   
2. 
   
3. // or for a safe cast:
   
4. 
   
5. var car = cast (vehicle, Car);
   
6. 
   
7. var toString = Std.string (10);
   
8. var toNumber = Std.parseFloat ("10");
   
9. var toInteger = Std.int (10.1);

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---

类型描述

AS3

1. if (vehicle is Car) {
   
2. 
   
3. }
   
4. 
   
5. import flash.utils.getDefinitionByName;
   
6. import flash.utils.getQualifiedClassName;
   
7. 
   
8. name = getQualifiedClassName (vehicle);
   
9. type = Class (getDefinitionByName (name);

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Haxe

1. if (Std.is (vehicle, Car)) {
   
2. 
   
3. }
   
4. 
   
5. type = Type.getClass (vehicle);
   
6. name = Type.getClassName (type);

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---

判定null

AS3

1. if (object == null) {
   
2. 
   
3. }
   
4. 
   
5. if (!object) {
   
6. 
   
7. }

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Haxe

1. if (object == null) {
   
2. 
   
3. }

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---

Hash Tables

AS3

1. var table:Object = new Object ();
   
2. table["key"] = 100;
   
3. 
   
4. trace (table.hasOwnProperty ("key"));
   
5. 
   
6. for (var key:Object in table) {
   
7. 
   
8.    trace (key + " = " + table[key]);
   
9. 
   
10. }
    
11. 
    
12. delete table["key"];

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Haxe

1. var table = new Map<String, Int> ();
   
2. table.set ("key", 100);
   
3. 
   
4. trace (table.exists ("key"));
   
5. 
   
6. for (key in table.keys ()) {
   
7. 
   
8. trace (key + " = " + table.get (key));
   
9. 
   
10. }
    
11. 
    
12. table.remove ("key");

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---

Rest Parameters

AS3

1. function test (...params):void {
   
2. 
   
3. }
   
4. 
   
5. test (1, 2, 3);

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Haxe

1. function test (params:Array<Dynamic>) {
   
2. 
   
3. }
   
4. 
   
5. Reflect.makeVarArgs (test) (1, 2, 3);

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---

Reflection

AS3

1. var foo = object["foo"];
   
2. 
   
3. bar.apply (this, [ "hi" ]);

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Haxe

1. var foo = Reflect.field (object, "foo");
   
2. 
   
3. Reflect.callMethod (this, bar, [ "hi" ]);

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---

Function Types

AS3

1. function hello (msg:String):void {
   
2. 
   
3. }
   
4. 
   
5. var type:Function = hello;

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Haxe

1. function hello (msg:String):Void {
   
2. 
   
3. }
   
4. 
   
5. var type:String->Void = hello;
   
6. 
   
7. // can also use Dynamic

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---

Getters and Setters

AS3

1. function get x ():Number {
   
2. 
   
3.    return _x;
   
4. 
   
5. }
   
6. 
   
7. function set x (value:Number):void {
   
8. 
   
9.    _x = value;
   
10. 
    
11. }

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Haxe

1. public var x (get, set):Float;
   
2. 
   
3. function get_x():Float {
   
4. 
   
5.    return _x;
   
6. 
   
7. }
   
8. 
   
9. function set_x(value:Float):Float {
   
10. 
    
11.    return _x = value;
    
12. 
    
13. }

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Read-Only Properties

AS3

1. function get x ():Float {
   
2. 
   
3.    return _x;
   
4. 
   
5. }

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Haxe

1. public var x (default, null):Float;
   
2. 
   
3. // null allows private access
   
4. // never would restrict all access

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