如何从JavaScript对象中删除键？ [重复]

本文翻译自：How do I remove a key from a JavaScript object? [duplicate]

This question already has an answer here: 这个问题已经在这里有了答案：

• How do I remove a property from a JavaScript object? 如何从JavaScript对象中删除属性？ 41 answers 41个答案

Let's say we have an object with this format: 假设我们有一个具有这种格式的对象：

var thisIsObject= {
   'Cow' : 'Moo',
   'Cat' : 'Meow',
   'Dog' : 'Bark'
};

I wanted to do a function that removes by key: 我想做一个通过键删除的函数：

removeFromObjectByKey('Cow');

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#1楼

参考：https://stackoom.com/question/EUuL/如何从JavaScript对象中删除键-重复

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#2楼

It's as easy as: 就像这样简单：

delete object.keyname;

or 要么

delete object["keyname"];

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#3楼

If you are using Underscore.js or Lodash, there is a function 'omit' that will do it. 如果您使用的是Underscore.js或Lodash，则可以使用函数“忽略”来实现。
http://underscorejs.org/#omit http://underscorejs.org/#omit

var thisIsObject= {
    'Cow' : 'Moo',
    'Cat' : 'Meow',
    'Dog' : 'Bark'
};
_.omit(thisIsObject,'Cow'); //It will return a new object

=> {'Cat' : 'Meow', 'Dog' : 'Bark'}  //result

If you want to modify the current object, assign the returning object to the current object. 如果要修改当前对象，请将返回对象分配给当前对象。

thisIsObject = _.omit(thisIsObject,'Cow');

With pure JavaScript, use: 对于纯JavaScript，请使用：

delete thisIsObject['Cow'];

Another option with pure JavaScript. 纯JavaScript的另一种选择 。

thisIsObject.cow = undefined;

thisIsObject = JSON.parse(JSON.stringify(thisIsObject ));

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#4楼

The delete operator allows you to remove a property from an object. delete运算符允许您从对象中删除属性。

The following examples all do the same thing. 以下示例都做同样的事情。

// Example 1
var key = "Cow";
delete thisIsObject[key]; 

// Example 2
delete thisIsObject["Cow"];

// Example 3
delete thisIsObject.Cow;

If you're interested, read Understanding Delete for an in-depth explanation. 如果您有兴趣，请阅读《 了解删除》以获取详细说明。