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通过Object.defineProperties设置属性时，可以为每个属性添加描述符，包括configurable、enumerable、writable、set和get。其中enumerable表示该属性是否是可枚举，默认值为false,在node环境中，如果不显式指定enumerable为true,则会忽略掉当前属性。...

JavaScript原型在学习原型之前，先看一下MDN文档中关于原型的描述：JavaScript is often described as a prototype-based language — to provide inheritance, objects can have a prototype object, which acts as a template object that it inherits methods and properties from.An object’s pro