in JS, within a function, if use the same variable name as defined in global before without var declaration, it means that you're using the same global variable and change its value. but in Python, within a function, you need to make a declaration as Global Variable.

in JS, Prefixing a variable with var defines a new variable. Omitting var updates an existing variable. (you should always use var to define a new variable)

in JS, within a function, if use the same variable name as defined in global before without var declaration, it means that you're using the same global variable and change its value. but in Python, within a function, you need to make a declaration as Global Variable.

in JS, Prefixing a variable with var defines a new variable. Omitting var updates an existing variable. (you should always use var to define a new variable)