循環散列

Question

在我的代碼中，字段長度始終爲0，並且我非常肯定它中有一些鍵 - 值對。

var fields = Reflect.fields(_commandMap); 
trace("mapping "+fields.length); 

Answer 1

您無法在哈希中以數組形式訪問值。

這裏是一個Hash

var a = new Hash(); 
a.set("hello", 0); 
a.set("bonjour", 1); 
a.set("ohai", 2); 

下面是一些方法，您可以訪問值/鍵：

for (value in a) 
{ 
    trace(value); //Will trace 0, 1, 2 (no assurance that it will be in that order) 
} 

for (key in a.keys()) 
{ 
    trace(key); //Will trace hello, bonjour, ohai (no assurance that it will be in that order) 
} 

如果你想你的哈希轉換爲數組，使用Lambda：

var valueArray = Lambda.array(a); 
trace(valueArray[0]); //can be 0, 1 or 2 

//since keys() returns an Iterator, not an Iterable, we cannot use Lambda here... 
var keyArray = []; 
for (key in a.keys()) keyArray.push(key); 
trace(keyArray[0]); //can be hello, bonjour or ohai