It provides a single api to manage the various scoped attributes 它提供惟一一个api来管理具有不同作用域的属性。
Ultimately , then , scoped variables are attributes of the four jsp scopes that have names that can be used as el identifiers 最终,限制了作用域的变量是四个jsp作用域的属性,这些属性具有可以用作el标识符的名称。