Reserved words in JavaScript

Reserved words cannot be used as variable names and function arguments, but as keys to objects, some can be used directly, and some need to be quoted

For example , a reserved word is valid in Firefox:

var obj = {Case:value};

Obj.case = value;

It's legal in Firefox, and it's not legal in other browsers.

Quotation marks can then be used to refer to:
var obj = {"Case": value};

obj["case"] = value;

is legal, so try not to use reserved words.

Reserved words such as int,long,float can be used as variable names in each browser, but reserved words are not recommended as variable names.

Reserved words in JavaScript