Surprised that global variable has undefined value in JavaScript

Question

Today, I got completely surprised when I saw that a global variable has undefined value in certain case.

Example:

var value = 10;
functi         


        

Answer 1

I was running into the same problem even with global variables. My problem, I discovered, was global variable do Not persist between html files.

I tried to reference myVar and myVarTwo in the loaded HTML file, but received the undefined error. Long story/day short, I discovered I could reference the variables using: