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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
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.
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) |