Web Programming Primer

A global variable is any variable declared outside of a function, while a local variable is any variable declared inside of a function. These are the only two types. A global variable can be used anywhere, but a local variable can only be used/called upon inside of its function. If you try to use a variable that you declared inside a function (a local variable) outside of that function, it will not work.

Just like with XHTML, JavaScript offers a way to insert comments. They are a means to insert ideas, thoughts, and such, without effecting the page during load time. To insert a comment in JavaScript, hit forward slash twice "//" followed by whatever you want to leave as a note. This will only give you one line to make a comment, so when you enter to the next line, you are no longer in the safety of a comment. For a multi-line comment, type "/*" followed by however many lines of text that you desire. To end the comment type "*/" and this will stop your comment.

Comments look like this: