First install the Firebug extension and then activate it by clicking the bug in the upper-right corner of your Firefox browser. Firebug will open a pane at the bottom of your browser window.
Click Console. Then click the little arrow in the lower-right corner to divide the pane into two panels.
Using Firebug with Firefox
You can also use the
console.log command instead of
alert to display messages on the left pane.
Using the console.log command
console.info. These other commands add little icons in the console to identify the result.
console.log("Hello World") command is similar to writing
alert("Hello World") except that it writes the string to the Firebug console instead. This simply allows you to see that the command was run.
Most examples declare variables, like this:
Many of the example scripts in this tutorial use the
console.log command for its simplicity.