1 1.缩略的条件表达式short conditional statements
2 var someVar:Number;
3 if(someVar)
4 doSomething();
5 2.缩略的构造函数short constructors
6 var point:Point = new Point;
7 3.throw不光用于抛出错误，还可以抛出对象Throwing objects
8 try
9 {
10 throw 1;
11 }
12 catch(n:Number)
13 {
14 trace(n); //outputs 1
15 }
16 4.arguments的一种特殊使用（arguments.callee代表arguments所在的函数） Arguments class
17 this.addEventListener('eventt',
18 function(event:Event):void
19 {
20 event.target.removeEventListener(event.type,arguments.callee);
21 trace(arguments.callee);
22 }
23 );
24 this.dispatchEvent(new Event('eventt'));
25 5.||= 逻辑或赋值(如果一个变量的值存在，则不赋新值给该变量，如果该值不存在，则赋值给该变量)logical or assignment
26 var num:Number;
27 num ||= 10;
28 trace(num); // outputs 10
29
30 num = 5;
31 trace(num); // outpus 5
32
33 num ||= 10;
34 trace(num); //outpus 5
35 trace(10 || 5);
36 6.获取指定对象的类构造函数Getting object class type
37 var obj:Sprite = new Sprite();
38 var clazz:Class = Object(obj).constructor;
39 trace(new clazz());
40 7.循环标签和continue的使用Labels & continue
41 var outerArray:Array = [1,2,3];
42 var innerArray:Array = [2,3,4];
43 outerLoop:for (var i:uint = 0;i < outerArray.length; ++i)
44 {
45 var foo:String = outerArray[i];
46 innerLoop:for(var j:uint = 0; j< innerArray.length; ++j)
47 {
48 var bar:String = innerArray[j];
49 if( foo == bar )
50 {
51 continue outerLoop;
52 }
53 }
54 trace(foo); //
55 }
56 8.Label & break
57 dateCheck:
58 {
59 trace('good morning')
60 var today:Date = new Date();
61 if(today.month == 9 && today.date == 11)
62 {
63 break dateCheck;
64 }
65 trace('time for work');
66 }
67 9.with的使用with statement
68 function polar(r:Number):void
69 {
70 var a:Number,x:Number,y:Number;
71 with(Math)
72 {
73 a= PI * pow(r,2);
74 x = r * cos(PI);
75 y = r *sin(PI/2);
76 }
77 trace('acos'+a);
78 trace('x-'+x);
79 trace('y-'+y);
80 }
81 polar(3);
82 10.像trace一样的全局函数global functions
83 //globalFunction.as file
84 package
85 {
86 public function globalFunction(text:String):void
87 {
88 trace(text);
89 }
90 }
91 11.包内函数internal functions
92
93 protected function someFunction():void
94 {
95 var internalFunction:Function = function(text:String):void
96 {
97 trace(text);
98 }
99
100 internalFunction('Hello world');
101 }
102 12.命名空间custom namespaces
103 //online.as file
104 package org.corlan
105 {
106 public namespace online = 'http://www.baidu.com';
107 }
108 //offline.as file
109 package org.corlan
110 {
111 public namespace offline = 'http://www.sdo.com/';
112 }
113
114 online function save(object:Object):void
115 {
116 trace('online');
117 }
118
119 offline function save(object:Object):void
120 {
121 trace('offline');
122 }
123
124 online::save(obj);
125 offline::save(obj);
126
127 13.代理类Proxy class
128 import flash.utils.Proxy;
129
130 dynamic class MyProxy extends Proxy
131 {
132 flash_proxy override function callProperty(name:*,...rest):*
133 {
134 }
135 flash_proxy override function getProperty(name:*):*
136 {
137 }
138 flash_proxy override function setProperty(name:*,...rest):*
139 {
140 }
141 }
摘录自adobe max上的演讲稿【As3 secrets】