如何在javascript中動態命名對象中的元素？

Question

我在function創建對象：

createObject(attr) { 
    return { 
     attr: "test" 
    } 
} 

我希望attr由function parameter命名。現在我結束了這個對象：

{ 
    attr: "test" 
} 

我該怎麼做？

Answer 1

創建一個新對象並使用括號表示法來設置屬性。

function createObject(attr) { 
    var obj = {}; 
    obj[attr] = "test"; 
    return obj; 
} 

Answer 2

這樣？

createObject(attrName) { 
    var obj = {}; 
    obj[attrName] = 'test'; 
    return obj; 
} 

Answer 3

我提出這個筆來展示如何來構造對象：

http://codepen.io/dieggger/pen/pJXJex

//function receiving the poarameter to construct the object 
var createObject = function(attr) { 
    //custom object with one predefined value. 
    var myCustomObject = { 
    anything: "myAnything", 
    }; 

//adding property to the object 
    myCustomObject[attr] = "Test"; 

//returning the constructed object 
    return myCustomObject; 

} 

//invoking function and assigning the returned object to a variable 
var objReturned = createObject("name"); 

//simple alert , to test if it worked 
alert(objReturned.name);