JavaScript對象：我在這裏做錯了什麼？

Question

var WEIGHT_KEY= 'weight'; 

var person{ 
    name: 'Ryan' 
    WEIGHT_KEY: 350 
    }; 

var weight = person;WEIGHT_KEY 

Answer 1

錯過了等號，對象屬性符號和對象屬性符號的句點之間的逗號。

var WEIGHT_KEY= 'weight'; 

var person = { name: 'Ryan', WEIGHT_KEY: 350 }; 

var weight = person.WEIGHT_KEY; 

jsFiddle Example

括號方法：

var person = {}; 
person['name'] = 'Ryan'; 
person[WEIGHT_KEY] = 350; 

Answer 2

應該是這樣的：

var WEIGHT_KEY= 'weight'; 

    var person = { name: 'Ryan' }; 
    person[WEIGHT_KEY] = 350; 

    var weight = person[WEIGHT_KEY]; 

JavaScript對象表現得像一個屬性袋，所以你可以使用屬性名稱就像獲取和設置的索引器一樣。