The onerror property of the SharedWorker interface represents an event handler, that is a function to be called when the error event occurs.
mySharedWorker.onerror = function(event) { ... };
The following code snippet creates a SharedWorker object using the SharedWorker() constructor and sets up an onerror handler on the resulting object:
var mySharedWorker = new SharedWorker('shared-worker.js'); mySharedWorker.onerror = function(event) { console.log('There is an error with your worker!'); }
| Specification | 
|---|
| HTML Standard (HTML) # handler-abstractworker-onerror  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onerror | 
4  | 
79  | 
29  | 
No  | 
10.6  | 
5-7  | 
No  | 
No  | 
33  | 
11-14  | 
5-7  | 
4.0-5.0  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker/onerror