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;
示例
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。
规范
Specification | Status | Comment |
---|---|---|
ECMAScript Latest Draft (ECMA-262) Debugger statement |
Draft | |
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. |
浏览器兼容
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out
https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
debugger |
Chrome Full support 5 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support Yes | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
Legend
- Full support
- Full support