JavaScript debugger statement

Definition and Usage

The debugger statement stops the execution of JavaScript and calls (if available) the debugging function.

Using the debugger statement has the same function as setting a breakpoint in the code.

通常，您可在浏览器中使用 F12 键激活调试，然后在调试器菜单中选择“控制台”。

Note:If no debugging is available, the debugger statement is invalid.

For more information on debugging in JavaScript, as well as how to start debugging if your browser does not support it, please read our JavaScript debugging tutorial.

Example

After opening the debugger, this code should stop executing before the third line:

var x = 15 * 5;
debugger;
document.getElementById("demo").innerHTML = x;

Try it yourself

Syntax

debugger;

Technical Details

JavaScript Version: ECMAScript 1

Browser Support

Statement Chrome IE Firefox Safari Opera
debugger Support Support Support Support Support

Related Pages

JavaScript Tutorial:JavaScript Debugging