JavaScript中不能作为变量名的关键字和保留字总结：
1、js中的关键字：
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
