JavaScript var statement

　JavaScript-Anweisungen und Variablendeklarationen

varA statement declares a variable and selects whether to initialize it with a value.

Variables are containers used to store information.

Creating a variable in JavaScript is called "declaring" a variable:

var city;

After declaration, the variable is empty (has no value).

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

city = "New Delhi";

You can also assign a value to a variable when you declare it:

var city = "New Delhi";

Var declarations, regardless of where they appear, are processed before any code is executed. This is calledHoisting.

If you redefine a JavaScript variable, it will not lose its value.

You can find ourJavaScript variable tutorialandIn the JavaScript scope tutorialLearn more about variables.

Syntax:

var identifier = value;

var city = "New Delhi";

Browser compatibility

All browsers fully support the var statement:

Parameterwert

Technische Details

Mehr Beispiele

Deklarieren und initialisieren Sie drei Variablen：

var x =　10, y =　15, z =　5;

Initialisieren Sie mehrere Variablen：

var x, y, z;//　Variable deklarieren
x = y = z =　10;　//　Variable initialisieren

Schau auch gerne nach

JavaScript-Tutorial：JavaScript-Variable

JavaScript-Tutorial：JavaScript-Scope

　JavaScript-Anweisungen und Variablendeklarationen