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ამასთან, შეგიძლიათ იხილოთ სტატიის English (US) ვერსია.
The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
while (condition) statement
condition
- An expression evaluated before each pass through the loop. If this condition evaluates to true,
statement
is executed. When condition evaluates to false, execution continues with the statement after thewhile
loop. statement
- An optional statement that is executed as long as the condition evaluates to true. To execute multiple statements within the loop, use a block statement (
{ ... }
) to group those statements.
Note: Use thebreak
statement to stop a loop before condition evaluates to true.
Examples
The following while
loop iterates as long as n
is less than three.
var n = 0; var x = 0; while (n < 3) { n++; x += n; }
Each iteration, the loop increments n
and adds it to x
. Therefore, x
and n
take on the following values:
- After the first pass:
n
= 1 andx
= 1 - After the second pass:
n
= 2 andx
= 3 - After the third pass:
n
= 3 andx
= 6
After completing the third pass, the condition n
< 3 is no longer true, so the loop terminates.
Specifications
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome Full support Yes | Edge Full support Yes | Firefox Full support 1 | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes |
Legend
- Full support
- Full support