HTML and CSS Reference
In-Depth Information
Debugging with console.log
There is one more thing to discuss before we explore bigger and better things beyond “Hello
World!” In this topic, we have implemented a very simple debugging methodology using the
console.log
functionality of modern web browsers. This function lets you log text mes-
sages to the JavaScript console to help find problems (or opportunities!) with your code. Any
browser that has a JavaScript console (Chrome, Opera, Safari, Firefox with Firebug installed)
can make use of
console.log
. However, browsers without
console.log
support throw a
nasty error.
To handle this error, we use a wrapper around
console.log
that makes the call only if the
function is supported. The wrapper creates a class named
Debugger
and then creates a static
function named
Debugger.log
that can be called from anywhere in your code, like this:
Debugger
.
log
(
"Drawing Canvas"
);
Here is the code for the
console.log()
functionality:
var
var
Debugger
=
function
function
() { };
Debugger
.
log
=
function
function
(
message
) {
try
try
{
console
.
log
(
message
);
}
catch
catch
(
exception
) {
return
return
;
}
}
