关于throw事件的Javascript？

Question

Is there a way in Javascript to listen to on throw events?

I want to be able to have an event handler be called even when code like this is executed:

var hi = "hi";
try {
  throw hi;
}
catch (e) {

}

In chrome (and maybe firebug too) you can run this code and hit "break on all errors" and it will break on that throw line. How exactly are they doing that? Is that outside of Javascript?

Answer 1

他们如何做到这一点是JavaScript引擎不会继续错误，它会在所有错误上崩溃，比如你编译c ++，它不是语言功能，它的浏览器

Answer 2

The answer you accepted is not correct.

If you have an error that happens not within try {} catch() {} block, then the JavaScript execution will really break at that point.

However, if you wrap your possibly breaking code in try {} catch() {} , you can use re- throw the error to be handled by one global event handler:

window.onerror = function (error) {
  // access `error` object
};

try {
  // for example try to assign property to non-existing object
  undefinedObj[property] = 1;
}
catch (error) {
  // `error` object will be available in `onerror` handler above
  throw new Error(error);
}

Answer 3

That's not event that's exception, the handler goes in the catch-block:

try {
    //....
}
catch (e) {
    // exception handling here
    // or may be fire/trigger some event here
}