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In this article Xiaobian for you to introduce in detail "JavaScript variables, similar algebra, identifier instance analysis", detailed content, clear steps, details handled properly, I hope this "JavaScript variables, similar algebra, identifier case analysis" article can help you solve doubts, the following follow the editor's ideas slowly in-depth, together to learn new knowledge bar.

JavaScript variable

The JavaScript variable is a container for storing data values.

In this case, x, y, and z are variables:

Example

Var x = 7

Var y = 8

Var z = x + y

From the example above, you can get:

X storage value 7

Y Storage value 8

Z storage value 15

Similar algebra

In this example, price1, price2, and total are variables:

Example

Var price1 = 7

Var price2 = 8

Var price3 = 12

Var total = price1 + price2 + price3

In programming, similar to algebra, we use variables such as price1 to store values.

In programming, similar to algebra, we use variables (total = price1 + price2) in expressions.

From the example above, you can calculate that the value of total is 15.

Tip: the JavaScript variable is a container for storing data values.

JavaScript identifier

All JavaScript variables must be identified by a unique name.

These unique names are called identifiers.

Identifiers can be short names (such as x and y) or more descriptive names (age, sum, totalVolume).

The general rules for constructing variable names (unique identifiers) are:

Names can contain letters, numbers, underscores, and dollar signs

The name must begin with a letter

The name can also start with $and _ (but we won't do that in this tutorial)

Names are case-sensitive (y and Y are different variables)

Reserved words (such as keywords for JavaScript) cannot be used as variable names

Tip: JavaScript identifiers are case sensitive.

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