For consistency with the built-in operators, the postfix operators should return the old (unincremented or undecremented) value. That value is returned as a value, not a reference.

• 为了与内置操作符一致，后缀式操作符应返回旧值（即，尚未自增或自减的值），并且，应作为值返回，而不是返回引用。