如何从一个javascript关联数组删除对象？ [英] How do I remove objects from a javascript associative array?

问题描述

假设我有这样的code：

Suppose I have this code:

var myArray = new Object();
myArray["firstname"] = "Bob";
myArray["lastname"] = "Smith";
myArray["age"] = 25;

现在，如果我想删除姓氏？......有没有结果的一些等价
myArray的[姓氏。删除（）？

Now if I wanted to remove "lastname"?....is there some equivalent of
myArray["lastname"].remove()?

（我需要去因为元素的数量是非常重要的元素，我想保持干净的东西。）

(I need the element gone because the number of elements is important and I want to keep things clean.)

推荐答案

使用删除关键字在Javascript。

Use the "delete" keyword in Javascript.

delete myArray["lastname"];

---

编辑：

在一些JavaScript引擎，删除关键字可能会伤害性能，因为它会撤消编译/ JIT优化。

In some JavaScript engine, the delete keyword might hurt performance as it will undo compile / JIT optimization.

<一个href=\"http://www.html5rocks.com/en/tutorials/speed/v8/\">http://www.html5rocks.com/en/tutorials/speed/v8/
<一href=\"http://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/\">http://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/

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