debugger
The debugger statement invokes any available debugging functionality, such as setting a breakpoint. If no debugging functionality is available, this statement has no effect.
Syntax
JavaScript
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debugger;
Examples
The following example shows code where a debugger statement has been inserted, to invoke a debugger (if one exists) when the function is called.
JavaScript
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function potentiallyBuggyCode() { debugger; // do potentially buggy stuff to examine, step through, etc. }
When the debugger is invoked, execution is paused at the debugger statement. It is like a breakpoint in the script source.
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2017 Draft (ECMA-262) The definition of 'Debugger statement' in that specification. |
Draft | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Debugger statement' in that specification. |
Standard | |
ECMAScript 5.1 (ECMA-262) The definition of 'Debugger statement' in that specification. |
Standard | Initial definition |
ECMAScript 3rd Edition (ECMA-262) The definition of 'Debugger statement' in that specification. |
Standard | |
ECMAScript 1st Edition (ECMA-262) The definition of 'Debugger statement' in that specification. |
Standard | Only mentioned as reserved word. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/statements/debugger