用三种循环来访问数组

var arr:Array=["A","B","C","D","E"]; 
var i:int;
arr.push(12.7);
for(i=0;i<arr.length;i++)
  trace(arr[i]);
trace("-----------------------------------");
for(var key:String in arr)
  trace(key,arr[key]);
trace("-----------------------------------");
for each(var item:* in arr) //星号是个通配符
  trace(item);
    //输出

A
B
C
D
E
12.7
-----------------------------------
0 A
1 B
2 C
3 D
4 E
5 12.7
-----------------------------------
A
B
C
D
E
12.7