Fix all errors in this code?

Question

So I discovered jsLint a few minutes ago. (https://www.jslint.com/)

I decided to try it out as i'm trying to improve my coding skills.

I pasted a code I wrote that displays errors on screen with the line number that the error occurred on.

Here's the code:

"use strict";
try {
//Empty try block. You can add whatever you want here.
} catch(error) {
window.onload = function ErrorMessage() {
var erroutput = document.getElementById("Error");
var err = error.stack;
err = err.match(/:[0-9]*:/);
err = error + " Line " + err + ")";
err = err.replace(/:/g, "");
erroutput.innerText = err;
};
}

How can I correct all of the errors I receive?

1. Unexpected "use strict". (No idea why this is occurring)
"use strict";

2. Empty block. (Easily Fixable)
try {

3. Unexpected trailing space. (Easily Fixable)
(This is just from the empty try block, which is fixed by adding code to the try block)

This function needs a "use strict" pragma. (No idea why this is occurring)
window.onload = function ErrorMessage() {

EDIT: Turning off "a browser" gives me these errors:

1. Undeclared 'window'.
window.onload = function ErrorMessage() {

2. Undeclared 'document'.
var erroutput = document.getElementById("Error");

Answer 1

Try this:

(function () {
"use strict";
try {
//Empty try block. You can add whatever you want here.
} catch(error) {
window.onload = function ErrorMessage() {
var erroutput = document.getElementById("Error");
var err = error.stack;
err = err.match(/:[0-9]*:/);
err = error + " Line " + err + ")";
err = err.replace(/:/g, "");
erroutput.innerText = err;
};
}
}());

https://code.sololearn.com/Wc84OIX0W0Sm/?ref=app

Answer 2

(function () {
"use strict";
var alert = alert;
try {
alert("Hello World!");
} catch (error) {
window.onload = function ErrorMessage() {
var erroutput = document.getElementById("Error");
var err = error.stack;
err = err.match(/:[0-9]*:/);
err = error + " (Line " + err + ")";
err = err.replace(/:/g, "");
erroutput.innerText = err;
};
}
}());

This is the code that had absolutely no errors as long as long as "a browser" is checked.

Answer 3

A browser is check for browser JavaScript codes.
Uncheck it for Node.js codes.
Node.js run from server, does not has DOM objects ljke window or document.

Answer 4

Adding a self-executing anonymous function for JavaScript module to prevent setting of "use strict" and variable declarations affect other JavaScript codes which are not belong to the module.

function() {
// all JavaScript codes here
}();