redirect Javascript syntax errors and console.log to somewhere else

问题

I'm trying to send whatever would normally appear in the javascript console to my own custom functions.

I've tried the following

window.console.error = window.console.debug =  window.console.log
window.console.log=mylog;

function mylog(msg){
    //send it somewhere just using alert as an example
      alert("log="+msg);    
}
console.log("yo");
var x=y;//a syntax error

Using the code above I only see the following alert "yo"

In the console log I see "x is not defined"
How do I redirect the syntax errors?

回答1:

You can use onerror it is designed to catch syntax errors.

window.onerror = function(message, source, lineno, colno, error) {
   alert(message);
}

Offical docs on MDN

回答2:

Here's a thread on this. Note the answer that shows how to "hijack" console.log() and send it wherever you want: Capturing javascript console.log?

来源：https://stackoverflow.com/questions/35759269/redirect-javascript-syntax-errors-and-console-log-to-somewhere-else