当前位置:网站首页>js對象獲取屬性的方法(.和[]方式)
js對象獲取屬性的方法(.和[]方式)
2022-07-06 07:21:00 【大象與小螞蟻】
js對象獲取屬性有兩種方法:1.通過.的方式 2. 通過[]方式
// 通過.方式獲取屬性值,key是靜態的
var aa = {
name: "zhang", age: 18};
console.log(aa.name);
// 通過[]獲取屬性值, key是動態的,可以是字符串,或者數字的形式
var bb = {
"apple": 3, "pear": 2}
var cc = {
1: "number1", 2: "number2"}
console.log(bb["apple"]);
console.log(cc[1]); // 注意這裏的寫法跟數組容易混淆,cc仍是對象,不是數組
// 獲取對象所有key的方法
console.log(Object.keys(bb)); // 輸出[ 'apple', 'pear' ]
边栏推荐
- TS Basics
- chrome查看页面fps
- C - Inheritance - polymorphism - virtual function member (lower)
- js对象获取属性的方法(.和[]方式)
- C语言 简单易懂的高精度加法
- 树莓派串口登录与SSH登录方法
- leetcode841. 钥匙和房间(中等)
- 杰理之BLE【篇】
- The ECU of 21 Audi q5l 45tfsi brushes is upgraded to master special adjustment, and the horsepower is safely and stably increased to 305 horsepower
- 【mysql学习笔记30】锁(非教程)
猜你喜欢
Go learning -- implementing generics based on reflection and empty interfaces
idea控制台彩色日志
leetcode1020. Number of enclaves (medium)
杰理之BLE【篇】
Internal and external troubles of "boring ape" bayc
When the Jericho development board is powered on, you can open the NRF app with your mobile phone [article]
Excel的相关操作
word中如何删除某符号前面或后面所有的文字
配置树莓派接入网络
Establishment and operation of cloud platform open source project environment
随机推荐
杰理之BLE【篇】
The ECU of 21 Audi q5l 45tfsi brushes is upgraded to master special adjustment, and the horsepower is safely and stably increased to 305 horsepower
Win10 64 bit Mitsubishi PLC software appears oleaut32 DLL access denied
杰理之蓝牙设备想要发送数据给手机,需要手机先打开 notify 通道【篇】
Bit operation XOR
L'auteur est mort? Ai utilise l'art pour conquérir l'humanité
Multithreading and concurrent programming (2)
Raspberry pie 3B update VIM
Markdown 中设置图片图注
杰理之开发板上电开机,就可以手机打开 NRF 的 APP【篇】
Select all the lines with a symbol in word and change them to titles
Ble of Jerry [chapter]
网络安全基础介绍
MPLS experiment
Top test sharing: if you want to change careers, you must consider these issues clearly!
Sélectionnez toutes les lignes avec un symbole dans Word et changez - les en titre
Openjudge noi 2.1 1749: Digital Square
The best way to learn SEO: search engine
js对象获取属性的方法(.和[]方式)
How can word delete English only and keep Chinese or delete Chinese and keep English