What is javascript grammar and how to use it?

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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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