What does javascript use to store data?

There are three ways for JavaScript to store data: 1. sessionStorage, which can save data in the session object; 2. localStorage, which can save data in the client's local hardware device; 3. cookie is used to store data In local computer files or browser memory.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javaScript has three data storage methods, namely:

• sessionStorage

• localStorage

• cookie

sessionStorage: Save data in the session object. The so-called session refers to the time that elapses from entering the website to closing the browser when the user is browsing a website, that is, the time the user spends browsing the website. The session object can be used to save any data required to be saved during this period.

localStorage: Save the data in the client’s local hardware device (usually the hard disk, but can also be other hardware devices). Even if the browser is closed, the data still exists. You can still use it the next time you open your browser to visit the website.

And Cookie is a piece of data stored on the client, but different browsers store cookies in different places:

• One is to store Cookie The data is saved in a file;

• The other is saved in the browser memory.

For example:

• IE browser

  The IE browser cookie data on Windows system is located in %APPDATA% The xxx.txt file in the \Microsoft\Windows\Cookies\ directory may contain many .txt Cookie files, such as C:\Users\yren9\AppData\Roaming\Microsoft\Windows\Cookies\0WQ6YROK.txt.

  In the IE browser, IE saves the cookies of each site as a plain text file such as XXX.txt;

• Firefox and Chrome browsers

  Firefox and Chrome save all cookies in a file, and the file format is a SQLite database format file.

  Firefox's cookie data is located in the xxx.default directory in the %APPDATA%\Mozilla\Firefox\Profiles\ directory, in a file named Cookies.sqlite, such as C:\Users\jay\AppData\Roaming \Mozilla\Firefox\Profiles\ji4grfex.default\cookies.sqlite.

  To view cookies in Firefox, you can select "Tools>Options>Privacy>Show Cookies".

  Chrome's cookie data is located in a file named Cookies in the %LOCALAPPDATA%\Google\Chrome\User Data\Default\ directory, such as C:\Users\jay\AppData\Local\Google\Chrome\User Data\Default\Cookies.

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