actionscript

 var a:int = 5;
var b:uint = 5;
trace(a==b);
trace(a===b);
b = 3;
trace(a<b);
trace(a>=0&&a<=10);

trace(typeof 10);
trace(typeof true);
trace(typeof Object);
trace(typeof [1,2,3]);

trace(9  is Number);
trace([1,2]  is Number);
trace([1,2]  is Array);

trace(9 as Number);
trace(9 as Array);

var arrs:Array = ["a","b","c"];
trace(2 in arrs);
trace(3 in arrs);

var aObject:Object = {age:10};
trace("age" in aObject);

var bObject:Object = {"status":"ok"};
delete bObject.status;
trace(bObject.status);

结果

true
true
false
true
number
boolean
object
object
true
false
true
9
null
true
false
true
undefined

 

 var a:Object={"name":"sanco","age":25,"weight":50};
 for(var k in a){
		trace("Key:\t"+k+"\tValue:\t"+a[k]);
	 }
	 
	 for each(var j in a){
		 trace("Key:\t"+j+"\tValue:\t"+a[j]);
		 }

 

 结果

Key: weight Value: 50
Key: name Value: sanco
Key: age Value: 25
Key: 50 Value: undefined
Key: sanco Value: undefined
Key: 25 Value: undefined