Wechat web developer tools tutorial, web development issues

01  Preface

2021 It's an extraordinary year , Many things have happened in this year , You know that . It is also a major blow to the Internet industry , Some enterprises also closed down in this epidemic , So maybe for this year 2021 It's a big test for the students who graduated in , It's also about our future .

This year's interviews are basically not offline interviews , They all take online calls / In the form of video , Today I would like to sum up , Share some interview questions you have encountered , I hope you can get satisfied in this spring move offer！ After all, I also saw many face scriptures of senior brothers and sisters , It's a feedback community . Mutual encouragement ！

Bytes to beat （ The school recruit ）

《 Analysis of front-end interview questions in large factories +Web Core summary learning notes + Enterprise project actual combat source code + HD explanation of the latest video 》 Free open source Hui Xin search official account 【 Advanced programming 】

 

one side ：

• TCP、UDP What is it? , difference , application

• What is a byte stream , What is datagram

• TCP Why reliable

• Over time retransmission 、 Cumulative confirmation process

• HTTP Follow TCP The connection of

• http Communication process

• http Header field , Has it been applied in the project at ordinary times , To be specific

• Cookie、localStorage、sessionStorage Have you used it ？ Talk about their connection, difference and Application

• Every request will bring cookie Do you ？ When will you bring

• cookie How to maintain login status

• Do you use cookie What have you done

• cookie Where to keep it

• After the user refreshes the interface , How does the server determine that the user is still logged in

• XSS And CSRF To understand how much , principle , How to prevent

• Algorithm ： Enter two numbers x,y; Output a that contains only letters a And letters b Random string requirements for ： There must be... In the string x individual a,y individual b ; Cannot appear in the output string aaa and bbb

Two sides ：

• By a class Many problems arising

• The interviewer gave a class Defined classes , put questions to ： Find out what's wrong , Why is it wrong , correct

• The way new Which instance properties and methods and prototype properties and methods the object has

• say something console.log(window.B) What output （B Is defined in the question class）

• If class One was returned in 1, Would be right new Does it have an impact on the object , Why? , When will it have an impact

• How to pass parameters when instantiating an object , Consider the number of known parameters and unknown parameters （ Investigate es6 The extension operator of ···）

• for...of Understand? , Which data structures can be used , If I want to use it to traverse object properties , How to achieve （

• LCA： Find the nearest common ancestor node of the multi fork tree

• Export a module ： The module is required to use localStorage Realization cookie Expiration function of

• use for Realization reduce

• What projects have been done , What is the biggest gain

• How long have you been in contact with the front end

• Introduce to you vue

• Let's talk about the principle of two-way binding

• v-if and v-show The difference between

• fictitious DOM,vue-router

• echarts Which have been used? , Has his realization ever understood

• DOM and BOM Introduce to you , What is their connection

• Have you ever used fetch,get、post and put The difference between

• Cross domain approach ( The more the better )

• chrome What functions have debugging tools used

• CSS Achieve two column layout , Fixed width on the left , Right adaptive

• Algorithm string decoding

Last

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[ Open source sharing ：【 Analysis of front-end interview questions in large factories + Core summary learning notes + Real project practice + The latest explanation video 】](()