如何使用变量将键添加到JavaScript哈希表？

Question

// Create the hashmap 
var animal = {}; 
// Add keys to the hashmap 
animal[‘cat’] = { sound: ‘meow’, age:8 }; 
animal[‘dog’] = { sound: ‘bark’, age:10 }; 
animal[‘bird’] = { sound: ‘tweet’, age:2 }; 
animal[‘cow’] = { sound: ‘moo’, age:5 }; 

我正在使用上面的代码尝试创建hashmap。我的问题是，如果放置声音和年龄，我将如何使用变量来放置它们。

例如

var one = 'sound'; 
var two = 'age'; 
animal['cat'] = {one: 'meow', two: 9}; 

Answer 1

在ES2015 +它是通过transpiler例如

var one = 'sound'; 
var two = 'age'; 
animal['cat'] = {[one]: 'meow', [two]: 9}; 

运行它babel，你会得到

var _animal$cat; 

var one = 'sound'; 
var two = 'age'; 
animal['cat'] = (_animal$cat = {}, _animal$cat[one] = 'meow', _animal$cat[two] = 9, _animal$cat); 

Answer 2

var animal = {}; 
 
var one = 'sound'; 
 
var two = 'age'; 
 

 
animal['cat'] = {}; 
 
animal['cat'][one] = 'meow'; 
 
animal['cat'][two] = 9; 
 

 
console.log(animal);