What are variables in javascript

Variables in JavaScript are containers used to store data. They can be used to store values ​​and expressions. Variables must start with a letter, and variable names are case-sensitive.

#The operating environment of this article: windows10 system, javascript 1.8.5, thinkpad t480 computer.

Variables are "containers" used to store data. As with algebra, JavaScript variables can be used to store values ​​(such as x=5) and expressions (such as z=x y).

Variables can have short names (such as x and y) or more descriptive names.

Note:

• Variables must start with a letter

• Variables can also start with $ and _ symbols (but we don’t This is recommended)

• Variable names are case sensitive (y and Y are different variables)

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