prototype与__proto__区别
创新互联公司主营徐闻网站建设的网络公司,主营网站建设方案,手机APP定制开发,徐闻h5小程序定制开发搭建,徐闻网站营销推广欢迎徐闻等地区企业咨询Each constructor is a function that has a property named “prototype” that is used to implement prototype-based inheritance and shared properties. Every object created by a constructor has an implicit reference (called the object's prototype) to the value of its constructor's “prototype” property.
When a constructor creates an object, that object implicitly references the constructor's prototype property for the purpose of resolving property references. The constructor's prototype property can be referenced by the program expression constructor.prototype, and properties added to an object's prototype are shared, through inheritance, by all objects sharing the prototype. Alternatively, a new object may be created with an explicitly specified prototype by using the Object.create built-in function. –ECMAScript® 2015 Language Specification
__proto__是每个对象都有的一个属性,而prototype是函数才会有的属性!!!
使用Object.getPrototypeOf()代替__proto__!!!
一、prototype
几乎所有的函数(除了一些内建函数)都有一个名为prototype(原型)的属性,这个属性是一个指针,指向一个对象,而这个对象的用途是包含可以有特定类型的所有实例共享的属性和方法。prototype是通过调用构造函数而创建的那个对象实例的原型对象。hasOwnProperty()判断指定属性是否为自有属性;in操作符对原型属性和自有属性都返回true。
示例:自有属性&原型属性
var obj = {a: 1}; obj.hasOwnProperty("a"); // true obj.hasOwnProperty("toString"); // false "a" in obj; // true "toString" in obj; // true
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