总结一下,对象继承的几种方式
1.构造函数绑定
function Person(){ this.speices ="人类" } function Women (name){ Person.apply(this); //or Rerson.call(this) 如果父类定义需要传参 参照apply call 传参方式 this.name = name; this.sex = "women" } console.log( new Women("cy").speices) //=> "人类" console.log( new Women("cy").constructor) //=> function Women (name)
2. prototype模式
function function Person(){ this.speices ="人类" } function Women (name){ this.name = name; this.sex = "women" } Women.prototype = new Person() Women.prototype.constructor = Women; console.log( new Women("cy").speices) //=>"人类" console.log( new Women("cy").constructor) //=> function Women (name)
3.空对象继承
function Person(){ this.speices ="人类" } function Women (name){ this.name = name; this.sex = "women" } function extend(Child, Parent) { var blank_obj = function () {}; blank_obj.prototype = Parent.prototype; Child.prototype = new blank_obj(); Child.prototype.constructor = Child; Child.uber = Parent.prototype; } extend(Women, Person)
4.非构造函数继承
var Person = {
speices:"人类",
attributes:['胎生','哺乳']
}
function deepCopy(p, c) {
var c = c || {};
for (var i in p) {
if (typeof p[i] === 'object') {
c[i] = (p[i].constructor === Array) ? [] : {};
deepCopy(p[i], c[i]);
} else {
c[i] = p[i];
}
}
return c;
}
var Women = deepCopy(Person)
Women.sex = 'women'
console.log(Women.attributes) //['胎生','哺乳']