debugger

debugger 语句调用任何可用的调试功能，例如设置断点。如果没有调试功能可用，则此语句不起作用。

语法

debugger;

下面的例子演示了一个包含 debugger 语句的函数，当函数被调用时，会尝试调用一个可用的调试器进行调试。

function potentiallyBuggyCode() {
    debugger;
    // do potentially buggy stuff to examine, step through, etc.
}

当 debugger 被调用时, 执行暂停在 debugger 语句的位置。就像在脚本源代码中的断点一样。

Specification	Status	Comment
ECMAScript (ECMA-262) Debugger statement	Living Standard
ECMAScript 2015 (6th Edition, ECMA-262) Debugger statement	Standard
ECMAScript 5.1 (ECMA-262) Debugger statement	Standard	Initial definition
ECMAScript 3rd Edition (ECMA-262) Debugger statement	Standard
ECMAScript 1st Edition (ECMA-262) Debugger statement	Standard	Only mentioned as reserved word.

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`debugger`	Chrome Full support 5	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support 10	Safari Full support 5	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support 10.1	Safari iOS Full support 4.2	Samsung Internet Android Full support 1.0	nodejs Full support 0.1.100