Reserved Words

以下这些是保留字，不能用于变量、函数名、过程、和对象名。The following are reserved as existing keywords by the ECMAScript specification:

• break
• case
• catch
• continue
• default
• delete
• do
• else
• finally
• for
• function
• if
• in
• instanceof
• new
• return
• switch
• this
• throw
• try
• typeof
• var
• void
• while
• with

以下是ECMAScript特性关键字：

• abstract
• boolean
• byte
• char
• class
• const
• debugger
• double
• enum
• export
• extends
• final
• float
• goto
• implements
• import
• int
• interface
• long
• native
• package
• private
• protected
• public
• short
• static
• super
• synchronized
• throws
• transient
• volatile

Take note that while not specified in ECMA-262, const, export, and import have been implemented in Mozilla.