AS3如何將一個數組的值賦給一個對象的Keys？

Question

我認爲這是與Eval相關的。

這裏，我有一個未知長度的數組在運行時。 說，例如，我想從數組作爲對象的按鍵分配值，如下：

var myArr:Array = ['a','b','c',...]; //unknown length 
var finalValue:int = 20; 
var myObj:Object = new Object(); 

assignValueToObject(); 

//logics of assignValueToObject function 
/* 
    //TODO.. black box 
*/ 

//In the end, myObj has the value stored and can be accessed like this 
myObj["a"]["b"]["c"][...] = 20; 

我不知道如果我需要訴諸eval.hurlant，我希望有一個簡單的這樣做的方式（遞歸或某物）

Answer 1

只需使用for循環遍歷數組的元素並創建除數組的最後一個元素之外的對象，該對象不應該是對象，而是所需的值。代碼未經測試。

var myArr:Array = ['a','b','c',...]; //unknown length 
var finalValue:int = 20; 
var myObj:Object = new Object(); 

// variable that holdsthe msot recently created sub-object 
var currentObject = myObj; 

// create nested objects up to the second last property name 
for (var index:int = 0; index < myArr.length -1; ++i) 
{ 
    currentObject = currentObject[element] = {}; 
} 

// add value to last property 
currentObject[myArr[myArr.length -1]] = finalValue; 

當然，如果你想插入你必須檢查嵌套對象結構已經包含一些屬性，以避免覆蓋那些現有的許多這樣的值。

我不得不說這看起來相當複雜，而且您試圖解決的實際問題可能比在數組中使用屬性名稱作爲字符串更優雅地解決的可能性很高。

Answer 2

@null和往常一樣正常，我只是添加了這個例子來實現大數字。 您也可以在一個循環中初始化這一點，所以你能夠讓你想要的東西（如空建議你）......

var myArray:Array = ["a", "b", "c"]; 
var mySecondArray:Array = ["a", "b", "c"]; 
var myValues:Array = ["first element", "secondt element", "third element"]; 
var relValues:Array = [150, 75, 500]; 
var indexedValues:Array = [1, 2, 3]; 
var myObject:Object; 
var mySecondObject:Object; 
function converArraytToObject(myArray:Array, myValues:Array):Object{ 
    var o:Object=new Object(); 
    for(var i:uint = 0; i < myArray.length; i ++){ 
     o[myArray[i].toString()] = myValues[i].toString(); 
    } 
    return o; 
} 
trace(myObject["a"]); 
// outputs "first element" 
trace(myObject["b"]); 
// outputs "second element" 
trace(myObject["c"]); 
// outputs "third element" 
// or 
trace(" ***UNSORTED"); 
for (var j in myObject){ 
    trace ("index name = [" + j + "] = " +myObject[j]); 
} 
// or 
trace(" ***SORTED by index"); 
for (var k = 0 ; k < myArray.length ; k++){ 
    trace ("index name = [" + myArray[k] + "] = " + myObject[myArray[k]]); 
} 
//or 
trace(" ***UNSORTED"); 
for (var l in mySecondObject){ 
    trace ("index name = [" + l + "] = " + mySecondObject[l]); 
} 
//or 
trace(" ***SORTED by index"); 
for (var m = 0 ; m < myArray.length ; m++){ 
    trace ("index name = [" + myArray[m] + "] = " + mySecondObject[myArray[m]]); 
} 

OUTPUT：

如果你想存儲的同一實例一個類，我建議你使用Vector類來代替Array。

first element 
secondt element 
third element 
    ***UNSORTED 
index name = [c] = third element 
index name = [a] = first element 
index name = [b] = secondt element 
    ***SORTED by index 
index name = [a] = first element 
index name = [b] = secondt element 
index name = [c] = third element 
    ***UNSORTED 
index name = [c] = 3 
index name = [a] = 1 
index name = [b] = 2 
    ***SORTED by index 
index name = [a] = 1 
index name = [b] = 2 
index name = [c] = 3 

ActionScript 3 fundamentals: Arrays

ActionScript 3 fundamentals: Associative arrays, maps, and dictionaries

ActionScript 3 fundamentals: Vectors and ByteArrays