JS Basic syntax

Basic syntax

In JS, is case-sensitive

Identifier

The so-called identifiers are names of variables, arrays, functions, etc.

The naming of identifiers requires following a certain naming convention

Naming rules are divided into two categories: rigid requirements, soft requirements

The so-called rigid requirements, means that must be observed, if not complied with, even the program can not run

Soft requirements: Not required to comply with, but is an unwritten rule of the industry

Mandatory requirements Specific rules:

Consists of letters, numbers, underscores, and $, but cannot start with numbers

Disable the use of keywords and reserved words inside ES

Case sensitive

Soft requirements: hope to know the meaning of the text

You can tell what this identifier means by using an identifier name.

Naming laws:

Hump nomenclature: The Hump naming method is divided into two kinds: the big hump and the small hump. The so-called Big Hump (Pascal nomenclature) means that each word is capitalized, for example: UserName the so-called small hump, the first letter lowercase, and the first letter of the following words for example: UserName

Hungarian nomenclature:

The so-called Hungarian nomenclature is made up of one or more words, preceded by a fixed prefix

Array (arrays) A_myuser

Boolean (Boolean) b_ispassed

function (functions) fn_dosth

Object (objects) O_person

Snake Name method

The so-called serpentine nomenclature refers to the use of underscores to separate each word.

User_name User_password

JS Basic syntax