有没有办法在javascript中指定类似下面的内容？varc={};c.a=function(){}c.__call__=function(function_name,args){c[function_name]=function(){};//itdoesn'thavetocapturec...wecanalsohavetheobjpassedinreturnc[function_name](args);}c.a();//callsc.a()directlyc.b();//goesintoc.__call__becausec.b()doesn'texist