你知之甚少的actionscript3 

  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】

posted @ 2011-10-11 13:50  硕气书生  Views(445)  Comments(2)  Edit  收藏  举报