Ref
Intro
- Portable Format Document
- A format meant to be displayed identicaly in all platforms and media
Log4js
Tips
- By default,
log4jslevel fordefaultcategory is set toOFF, thus not outputting any logs. To turn on logging,levelmust be set other thanOFF. - Levels: TRACE -> DEBUG -> INFO -> WARN -> ERROR -> FATAL
cookie, localStorage, sessionStorage
Comparison
| Name | Description | Size | Life |
|---|---|---|---|
| Cookie | Small piece of text data filed by server and saved in browser and carried in every request. Mostly used for identifying user. | 4KB | User defined expiration. Default cleared on browser close. |
| localStorage | Permanent storage for each domain. Not used in request. | 5MB | Permanent, unless cleared. |
| sessionStorage | Transient storage for each domain. Not used in request. | 5MB | Available in current session. Cleared when tab or browser closed/refreshed. |
Javascript this && Javascript Class VS Function
Ref
What is this
thisin Javascript refers to the context of the statement in which it is being executed.
