Case Analysis of JavaScript variable usage

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JavaScript variable

Variables are "containers" used to store information.

Example

Varx=5

Vary=6

Varz=x+y

Just like algebra.

Xero5

Yizhi6

Z=x+y

In algebra, we use letters (such as x) to preserve values (such as 5).

From the expression z=x+y above, we can calculate that the value of z is 11.

In JavaScript, these letters are called variables.

Lamp you can think of variables as containers for storing data.

JavaScript variable

Like algebra, the JavaScript variable can be used to store values (such as XForm5) and expressions (such as z=x+y).

Variables can use short names (such as x and y) or more descriptive names (such as age,sum,totalvolume).

Variables must start with a letter

Variables can also start with the $and _ symbols (although we do not recommend this)

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

Both lampJavaScript statements and JavaScript variables are case-sensitive.

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