出于某种原因,在下面的代码段中,构造函数委托似乎不起作用:
function NotImplementedError() {
Error.apply(this, arguments);
}
NotImplementedError.prototype = new Error();
var nie = new NotImplementedError("some message");
console.log("The message is: '"+nie.message+"'")
运行该命令得到的消息是:"。有什么想法,为什么,或者是否有更好的方法来创建一个新的错误子类?是否有一个问题,应用到本机错误构造函数,我不知道?
我也遇到过类似的问题。我的错误需要是error和NotImplemented的实例,它还需要在控制台中产生一致的回溯。
我的解决方案:
var NotImplemented = (function() {
var NotImplemented, err;
NotImplemented = (function() {
function NotImplemented(message) {
var err;
err = new Error(message);
err.name = "NotImplemented";
this.message = err.message;
if (err.stack) this.stack = err.stack;
}
return NotImplemented;
})();
err = new Error();
err.name = "NotImplemented";
NotImplemented.prototype = err;
return NotImplemented;
}).call(this);
// TEST:
console.log("instanceof Error: " + (new NotImplemented() instanceof Error));
console.log("instanceof NotImplemented: " + (new NotImplemented() instanceofNotImplemented));
console.log("message: "+(new NotImplemented('I was too busy').message));
throw new NotImplemented("just didn't feel like it");
使用node.js运行的结果:
instanceof Error: true
instanceof NotImplemented: true
message: I was too busy
/private/tmp/t.js:24
throw new NotImplemented("just didn't feel like it");
^
NotImplemented: just didn't feel like it
at Error.NotImplemented (/Users/colin/projects/gems/jax/t.js:6:13)
at Object.<anonymous> (/Users/colin/projects/gems/jax/t.js:24:7)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:487:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)
该错误通过了我的所有3个标准,尽管stack属性是非标准的,但在大多数较新的浏览器中都支持它,这在我的情况下是可以接受的。
上面的很多方法都不起作用。
最后一个是一个实际的错误。如果您使用字符串,它看起来很好,但它不会提供堆栈跟踪。如果你抛出错误,你不能有“Uncaught BadError: bad”,所以你必须删除自定义错误(遗憾的是)。如果你抛出一个对象,它看起来有点偏离,最后一个只是一个平均错误。
此方法创建一个具有自定义名称的错误,同时保留堆栈跟踪:
var errProto = Object.create(Error.prototype, {
constructor: {
value: Error,
enumerable: false,
writable: true,
configurable: true
}
})
var isFirefox = !!window.InstallTrigger
// Hide stack for Firefox only, as stacks can cause problems with high "frame" counts.
function createError(name, message, hideStack) {
if (message == null) {
message = ""
}
var customError = Error(message)
customError.name = name
Object.setPrototypeOf(customError, errProto)
if (isFirefox && hideStack) {
customError.stack = ""
} else if (isFirefox) {
var stack = customError.stack
var newline = stack.indexOf("\n") + 1
stack = stack.slice(newline)
customError.stack = stack
var split = stack.split(":")
if (split.length > 4) {
var a = split[3]
var b = split[4]
var t = b.slice(0, b.indexOf("\n"))
customError.lineNumber = Number(a)
customError.columnNumber = Number(t)
}
} else {
var stack = customError.stack
var split = stack.split("\n")
var secondPart = split.slice(2).join("\n")
stack = split[0] + "\n" + secondPart
customError.stack = stack
var split = secondPart.split(":")
var a = split[2]
var b = split[3]
}
throw customError
}
var frame = 0
function aFunction() {
if (++frame === 100) {
createError("LazyError", "function getting lazy", false, true)
} else {
requestAnimationFrame(aFunction)
}
}
setTimeout(aFunction, Math.random() * 500)
* {
font-family: Verdana;
}
Check your inspector!