A brief introduction to the naming rules of identifiers in JavaScript

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There are the following rules for naming identifiers in JavaScript:

Made up of letters, numbers, $, _

Start with the letter, $, _

Do not use reserved words!

Be meaningful!

Naming conventions for identifiers:

1. Hump nomenclature

Except for the first word of the identifier, the first letter of the other words is capitalized, for example: trueName

two。 Snake nomenclature

Words are separated by _, for example: true_name

(note: in most cases, identifiers that begin with 1 or 2 underscores represent special or internal variables. When we define them ourselves, we try to avoid using variables that begin with an underscore.)

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