timer

intermittent

open

let <timer name> =setInterval(<function name>,<time(ms)>)

let <timer name> =setInterval(function(){},<time(ms)>)

return is id number

clear

clearInterval(<timer name>)

delayed

open delayed

let <timer name> =setTimeout(<function name>,<time(ms)>)

clear

clearTimeout(<timer name>)

this object

this

when a function is passed to another function call

Change direction

1. call

   Call a function and change this to point to

   TEXT

   复制

   1

   <function>.call(<thisArg>,<arg1>,<arg2>,...)

   • thisArg：The specified ‘this’ points to
   • arg1,arg2：Transferred parameters

2. apply

   Call a function and change this to point to

   TEXT

   复制

   1

   <function>.apply(<thisArg>,[<argsArray>])

   • thisArg：The specified ‘this’ points to
   • <argsArray>：The parameters passed must be included in the array

3. bind

   Will not call a function but will change it to point to

   TEXT

   复制

   1

   <function>.bind(<thisArg>,<arg1>,<arg2>,...)

   • thisArg：The specified ‘this’ points to
   • arg1,arg2：Transferred parameters
   • return：Pointing function

callback function

representing the current environment, who is clling it

get site and size

<DOM>.getBoundingClientRect()

windows

- windows
    - navigator
    - loctation
    - document
    - history
    - screen

location

location

saved various parts of the url

attribute

• href：full url
• search：？The latter part
• hash：#The latter part

function

• reload(<parameter>)

  true：force flush

navigator

navigator

browser related information

history

history

history and address bar operations

history function

• forward
• back
• go(<number>)：positive number forward,negative number backward

storage

localstorage

localStorage

1. permanently stored locally in the form of key value pairs
2. multiple pages can be shared

save

localStorage.setItem("<key>","<value>")

get

localStorage,getItem("<key>")

revise

localStorage.setItem("<key>")

strore complex data types

JSON.tsringify(<complex data>)

convert complex data types to json for storage

reverce

JSON.parse(<JSON string>)

sessionstorage

1. The lifecycle to close tthe browser
2. the same page can be shared

other are the same as localstorage

get all keys

Object.keys(<object name>)

Returned is an array

get all values

Object.values(<object name>)

Returned is an array

add object

Object.assign(<new>,<old>)