Use es5 to implement const by modifying the attribute descriptor writable:

Function: Implement modularization

Disadvantages: Causes memory leaks

Initialization state: pennding

Completion status: resolved

Rejection status: rejected

The resolve method is called when changing from pending to resolved.

Call the reject method when changing from pennding to rejected

Put promises together: Promise.all()

Any promise can be completed: Promise.race()

Generate a promise whose status immediately changes from pennding to resolved: Promise.resolve()

Generate a promise whose status immediately changes from pennding to reject: Promise.rejected()

es6 class

es5 function prototype chain

Features

js only has single inheritance

super keyword

Static properties are written outside the class

Static methods are modified with static

export function getData(){}

import {getData} from '…'

export default

import getData

export * from '…'

Two parameters, define

Exports: module.exports

Import: require

Lazy loading of images

Lazy loading of lists

Lazy loading of routes

Image preloading

Throttle

debounce

Redraw

reflow

short link

long link

Reliable transmission method: TCP, which is equivalent to making a phone call. The handshake is successful three times before data is transmitted.

Unreliable method: UDP, which is equivalent to writing a letter and transmitting data directly, regardless of whether a connection is established or not.

IP

DNS service

Mac address

Hardware communication equipment: switches, routers

twisted pair

Client credentials: cookie, has validity limit

Client information: user-agent

Where to initiate access: refer

Request type: Content-Type

Set cookies: set-cookie

Whether to compress: content-encoding:gzip

Allow cross-origin: access-control-allow-origin:

Whether to allow cookies: access-control-allow-credentials:true

Save the token for a period of time and bring verification every time you call the interface.

When recording the login status, record the device number of each logged-in device. After logging in, change all other login statuses to invalid status.

After successfully logging in, call the login interfaces of several other domain names and set cookies respectively. The shared login state has been reached.

After calling the login interface, save the login status token returned by the server in the local cookie.

Set the corresponding expiration time

Just bring the token with you every time you call the interface in the future.

charles packet capture tool mapping

virtual domain name

proxy

JSONP

CORS (cross origin resource share)

proxy

Inject a piece of js into someone else's website and do some dangerous operations

Principle: Relying on the request initiated, the browser will automatically bring the cookie under the corresponding domain name.

Prevent attacks: Add verification codes and random numbers to increase the submission threshold

Status code: 200 (from cache)

expires: http1.0, if the request occurs before the expiration time, it hits the local strong cache

cache-control: http 1.1 enriches client caching mechanism

If cache-control and expires exist at the same time, cache-control has a higher priority than expires.

Status code: 304 (not modified)

Last Modified/If Modified-Since: The last modification time of the resource on the server, accurate to seconds

Etag/If None Match: The unique identification string of each resource. This value will change as long as the resource changes.

Last-Modified and ETag can be used together. The server will verify the ETag first. If they are consistent,

Change the application path of resources in the page

(Defined interface time, development time, joint debugging time)

Spliced ​​into a path form: send an email to the test, which contains the test address and some instructions

TAPD

Zen Tao

Trello

RAP, EASY-MOCK, MOCK.js

Recording interface, docute, vuepress

product manager

Determine specific needs

Just decide on the interface and communicate on the schedule.

Technology selection

Take control of the entire project

Product Manager (2)

Operations staff (1)

UI design(2)

Front-end development(4)

Back-end development(7)

Testers (2)

Operation and maintenance personnel (responsible for going online and configuring the online environment) (1)

code: status code

data: business data

msg: error message, returned by the backend, the frontend usually prompts directly

("zhixi2","123456",${ new Date()})

'${req.body.username} and password='${req.body.password}'

List services: pm2 list

Stop service: pm2 stop ${id}

Start the service: pm2 start ${id}

Restart the service: pm2 restart ${id}

Check the log: pm2 log

Start the web service: app.listen()

Listening routes: app.get() | app.post()

Get parameters: body-parser

Return data: res.json() | res.end() | res.send()

Tool for automatic updates: node-dev

Git hooks listen for push events