克隆/复制Map实例 [英] Clone/copy a Map instance

问题描述

如何在JavaScript中克隆/复制地图？

How do I clone/copy a map in JavaScript?

我知道如何克隆数组但是如何克隆/复制地图？

I know how to clone an array but how do I clone/copy a map?

var myArray = new Array(1, 2, 3);
var copy    = myArray.slice();
// now I can change myArray[0] = 5; & it wont affect copy array

// Can I just do the same for map?
var myMap = new ?? // in javascript is it called a map?
var myMap = {"1": 1, "2", 2};
var copy  = myMap.slice(); 

推荐答案

一种简单的方法（进行浅层复制）是将源映射的每个属性复制到目标映射：

A simple way (to do a shallow copy) is to copy each property of the source map to the target map:

var newMap = {};
for (var i in myMap)
   newMap[i] = myMap[i];

注意：newMap [i]很可能是对与myMap [i]

NOTE: newMap[i] could very well be a reference to the same object as myMap[i]

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