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This article mainly introduces how to create variables in JavaScript, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Declare (create) JavaScript variables

Creating a variable in JavaScript is called a "declaration" variable.

You can declare the JavaScript variable through the var keyword:

Var carName

After declaration, the variable has no value. (technically, its value is undefined. )

To assign a value to a variable, use the equal sign:

CarName = "porsche"

You can assign values to a variable when you declare it:

Var carName = "porsche"

In the above example, we created a variable named carName and assigned the value "porsche" to it.

Then, we "output" this value in the HTML paragraph of id= "demo":

Example

Var carName = "porsche"; document.getElementById ("demo") [xss_clean] = carName

Tip: it's a good habit to declare all variables at the beginning of the script!

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