javascript - 如何在JavaScript中创建哈希或字典对象[重复](How to create a hash or dictionary object in JavaScript [duplicate])

Question

This question already has an answer here:

(这个问题已经在这里有了答案：)

• JavaScript Hashmap Equivalent 17 answers

  (相当于JavaScript Hashmap的 17个答案)

I want to create a map object in javascript.

(我想在javascript中创建一个地图对象。)

I came to the following idea:

(我想到了以下想法：)

 var a = new Array();
 a["key1"] = "value1";
 a["key2"] = "value2";

but then how I can find if a particular key exists or not?

(但是那我怎么才能找到一个特定的键是否存在？)

  ask by Saurabh Kumar translate from so

Answer 1

Don't use an array if you want named keys, use a plain object.

(如果要命名键，请不要使用数组，而应使用普通对象。)

var a = {};
a["key1"] = "value1";
a["key2"] = "value2";

Then:

(然后：)

if ("key1" in a) {
   // something
} else {
   // something else 
}