JavaScript global variables and local variables

If a variable is defined in a function, it is possible to access the variable every time the function is called, simply saying that the scope in the function body is useful. It is useless to go beyond this range.

and global variables: If you define a variable outside of a function, then this variable is a global variable. And the variable can be accessed and modified within a continuous range. This is the global variable. If a variable is defined in a function, the same variable name is defined outside the function definition.

Cases:

var fun=9; ................ 1

function FunC () ..... 2

{

fun=10;
}

Alert (fun), ......... ........ 3

If the function is in 1-3 order. Then the fun result is 9.

JavaScript global variables and local variables