This article describes how JS uses onerror to catch exceptions. Share it for your reference, as follows:
If you need to utilize the onerror event, you must create a function that handles the error. You can call this function onerror event handler. This event handler uses three parameters to call: msg (Error message), url (url of the page where the error occurred), and line (line of the code where the error occurred).
<head><script type="text/javascript">onerror=handleErrvar txt=""function handleErr(msg,url,l){txt="There was an error on this page./n/n"txt+="Error: " + msg + "/n"txt+="URL: " + url + "/n"txt+="Line: " + l + "/n/n"txt+="Click OK to continue./n/n"alert(txt)return true}function message(){adddlert("Welcome guest!")}</script></head><body><input type="button" value="View message" onclick="message()" /></body></html>For more information about JavaScript related content, please check out the topics of this site: "Summary of JavaScript Errors and Debugging Skills", "Summary of JavaScript Mathematical Operation Usage", "Summary of JSON Operation Skills in JavaScript", "Summary of JavaScript Switching Special Effects and Skills", "Summary of JavaScript Search Algorithm Skills", "Summary of JavaScript Animation Special Effects and Skills", "Summary of JavaScript Data Structures and Algorithm Skills" and "Summary of JavaScript Traversal Algorithm and Skills"
I hope this article will be helpful to everyone's JavaScript programming.