JavaScript 中最​​重要的保留字

JavaScript 保留了一些关键字，这些关键字在当前的语言版本中并没有使用，但在以后 JavaScript 扩展中会用到。

abstract	else	instanceof	super
boolean	enum	int	switch
break	export	interface	synchronized
byte	extends	let	this
case	false	long	throw
catch	final	native	throws
char	finally	new	transient
class	float	null	true
const	for	package	try
continue	function	private	typeof
debugger	goto	protected	var
default	if	public	void
delete	implements	return	volatile
do	import	short	while
double	in	static	with