javascript node.js 在 try catch 中获取行号？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/5802840/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
javascript node.js getting line number in try catch?
提问by Mark
I'm using try catch on a node.js script:
我在 node.js 脚本上使用 try catch：
try {} catch (err) {console.log(err)}
I get an output like this:
我得到这样的输出：
{ stack: [Getter/Setter],
arguments: [ 'undefined' ],
type: 'called_non_callable',
message: [Getter/Setter] }
Is there an easy way to make this more informative? Include line numbers and function names and such?
有没有一种简单的方法可以让这个信息更丰富？包括行号和函数名等等？
回答by schaermu
Those [Getter/Setter]members indicate further information available on the error object. You can easily dump the contents of those getters/setters using a small helper function (very trivial implementation, further refinement is up to you)
这些[Getter/Setter]成员指示有关错误对象的更多信息。您可以使用一个小的辅助函数轻松转储这些 getter/setter 的内容（非常简单的实现，进一步细化取决于您）
function dumpError(err) {
if (typeof err === 'object') {
if (err.message) {
console.log('\nMessage: ' + err.message)
}
if (err.stack) {
console.log('\nStacktrace:')
console.log('====================')
console.log(err.stack);
}
} else {
console.log('dumpError :: argument is not an object');
}
}
try {
not_defined.function_call();
} catch(err) {
dumpError(err);
}
You could also extend the Object.prototypefor improved accessability (so you could use err.dumpError()), although extending Object.prototypebears the risk of overwriting existing functionality.
您还可以扩展Object.prototype以提高可访问性（因此您可以使用 err.dumpError()），尽管扩展Object.prototype承担覆盖现有功能的风险。
