Gossip js Scope

The JS lexical environment includes the environment variable binding and the external reference ' function created with an internal property [[scope]], which points to the lexical environment object of the current function. The external reference to the lexical environment is a lexical environment ' until the global lexical environment ', which external reference is null ', thus constituting a scope chain. When entering executable code, ' Create Execution Environment ' execution environment includes the lexical environment variable environment and this keyword binding ' if it is a function ' It also creates a new lexical environment object added to the current scope chain front end ' This is an external reference to the active object ' active object ' before this is the topmost execution environment '