如何在JavaScript中创建哈希或字典对象 [英] How to create a hash or dictionary object in JavaScript

问题描述

我想在javascript中创建一个地图对象。我来到了以下想法：

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

但是如何找到某个特定键是否存在？

解决方案

如果要使用命名键，请使用一个普通对象。

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

然后：

 code> if（key1in a）{
 // something 
} else {
 // else else 
} 
  

I want to create a map object in javascript. I came to the following idea:

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

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

解决方案

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

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

Then:

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

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