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, as in any programming language, hold numbers, strings, and other values used by a program. They are declared using the var .

declare a variable in JavaScript

Select the name of a variable that meets the guidelines of JavaScript. Variable names can contain only numbers, letters or underlined, and must begin with a letter or underscore. The distinction between capital and lowercase, the variable is different from ABC abc .

Finding the best place to declare your variable. Variables declared outside a function are available to all commands in the script, and are called “global”, while the variables unique to a specific function, are “local,” declared within the function .

variable is declared using the var command, as follows: var my_variable ;

Adding additional variables to the statement of compactness: var one_var, two_var ;

Specify an initial value for the variable along with an equal sign and the value: var zero = 0,

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