JS删除对象中某一属性案例详解_JavaScript

JS删除对象中某一属性案例详解

2021-09-18 17:02李大玄 JavaScript

这篇文章主要介绍了JS删除对象中某一属性案例详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

代码如下

				?

									var obj={

									    name: 'zhagnsan',

									    age: 19 

									}

									delete obj.name //true

									typeof obj.name //undefined

通过delete操作符, 可以实现对对象属性的删除操作, 返回值是布尔

可以删除其他东西吗

1.变量

				?

									var name ='zs' //已声明的变量

									delete name //false

									console.log(typeof name) //String

									age = 19 //未声明的变量

									delete age   //true

									typeof age //undefined

									this.val = 'fds' //window下的变量

									delete this.val  //true

									console.log(typeof this.val) //undefined

已声明的变量windows下的变量可以删除, 未声明的变量不可删除

2.函数

				?

									var fn = function(){} //已声明的函数

									delete fn   //false

									console.log(typeof fn) //function

									fn = function(){} //未声明的函数

									delete fn   //true

									console.log(typeof fn) //undefined

3.数组

				?

									var arr = ['1','2','3'] ///已声明的数组

									delete arr //false

									console.log(typeof arr) //object

									arr = ['1','2','3'] //未声明的数组

									delete arr //true 

									console.log(typeof arr) //undefined

									var arr = ['1','2','3'] //已声明的数组

									delete arr[1] //true

									console.log(arr) //['1','empty','3']

4.对象

				?

									var person = {

									 height: 180,

									 long: 180,

									 weight: 180,

									 hobby: {

									  ball: 'good',

									  music: 'nice'

									 }

									}

									delete person ///false

									console.log(typeof person)  //object

									var person = {

									 height: 180,

									 long: 180,

									 weight: 180,

									 hobby: {

									  ball: 'good',

									  music: 'nice'

									 }

									}

									delete person.hobby ///true

									console.log(typeof person.hobby) //undefined