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This article mainly explains "what is javascript grammar and how to use it". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is javascript grammar and how to use it".

JavaScript syntax is a set of rules that define the language structure of JavaScript, while JavaScript is a scripting language and a lightweight but powerful programming language.

This article operating environment: windows7 system, javascript1.8.5 version, Dell G3 computer.

What is the javascript syntax?

JavaScript syntax is a set of rules that define the language structure of JavaScript.

Var x, y _ Splash / how to declare the variable x = 7; y = 8 ~ * / how to assign z = x + y * / how to calculate the value

JavaScript value

The JavaScript statement defines two types of values: mixed values and variable values.

Mixed values are called literal quantities (literal). Variable values are called variables.

JavaScript literal quantity

The most important rule for writing mixed values is:

You can write a value with or without decimal point:

15.9010011

A string is text, enclosed in double or single quotation marks:

"Bill Gates" 'Bill Gates'

JavaScript variable

In a programming language, variables are used to store data values.

JavaScript uses the var keyword to declare variables.

The = sign is used to assign values to variables.

In this case, x is defined as a variable. Then, x is assigned a value of 7:

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