JavaScript

Understanding closure

Foreword closure is one of the most common interview questions , Many people are asked about the knowledge of closures in the interview , What is ...
2021-04-10 17:30 views 31

First knowledge Mongdb Data query （ three ）

db.getSiblingDB('cqust');var query criteria ={'sno':2019000000};var update criteria ={$set:{'body.weight':100,'name':' Wang Xiaowang '}};db.stude...
2021-04-07 18:24 views 26

javascript Adding and deleting form information

JavaScript introduction JavaScript It's a lightweight , Interpretive Web development language , The language system is not very complicated , Easy...
2021-04-03 13:22 views 28

JavaScript study （ Scope ）

Scope （Scope） The concept of scope refers to the scope of a variable , stay js in , There are two kinds of scopes . global scope . Function scope ...
2021-04-03 11:54 views 22

JavaScript study （ Return value ）

Example of return value of function ：function sum(a,b){ return a + b;return The purpose of this is to end the method . be careful ：return The f...
2021-04-02 19:58 views 30

JavaScript study （ Function declaration and parameters ）

Function introduction function ： Is to encapsulate some functions or statements , When needed , By calling , Execute these statements . A function...
2021-04-02 16:50 views 27

Prototype and prototype chain prototype and proto The difference between

prototype , Prototype chain ,new(),constructor,call/apply
2021-03-13 11:31 views 35

use JavaScript Written Tetris games （ It's simple , Very detailed ）

Effect writing external framework <!DOCTYPE html><html> <head lang="en"> <meta charset="UTF-8"> <title></title&...
2021-02-25 21:20 views 23

How should Xiaobai learn java?

Section 1 chapter Java introduction 1.1　 History and future direction of computer language 1.1.1　 Computer has become the extension of human brain...
2021-01-26 18:53 views 18

ES6 New attribute let（var Upgraded version of ） Solve the problem instead of function closure

understand ES6 of let Attribute and var Differences between let Introduction and of var Differences between 1.var No block level scope , and let ...
2020-12-07 20:41 views 21
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