The do...while
statement creates a loop that executes a specified statement until the test condition evaluates to false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once.
do statement while (condition);
statement
block
statement ({ ... }
) to group those statements.condition
condition
evaluates to true, the statement
is re-executed. When condition
evaluates to false, control passes to the statement following the do...while
.do...while
In the following example, the do...while
loop iterates at least once and reiterates until i
is no longer less than 5.
<div id="example"></div>
var result = ''; var i = 0; do { i += 1; result += i + ' '; } while (i < 5); document.getElementById('example').innerHTML = result;
Specification | Status | Comment |
---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2 |
ECMAScript 5.1 (ECMA-262) The definition of 'do-while statement' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'do-while statement' in that specification. | Standard | Trailing ; is now optional. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'do-while statement' in that specification. | Draft |
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | 6 | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/do...while