JavaScript中不能作爲變量名的關鍵字和保留字總結：
1、js中的關鍵字：
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
2、js中的保留字：
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