一直以来对js继承这块不是很懂，然后就在高程三上面反复对这块看了几遍，对这几天看的内容作如下整理。
对于OO（Object-Oriented）模式来说，其继承方式有接口继承和实现继承，而对于EcmaScript来说只支持实现继承，而且其实现继承是依靠原型链来实现的。
原型链继承
functionSuperTypes() {
this.property=true;
}
SuperTypes.prototype.getProperty=function() {
console.log(this.property);
}
functionSubTypes() {
this.name='lisp';
}
// 原型链继承
SubTypes.prototype=newSuperTypes();
SubTypes.prototype.getName=function() {
console.log(this.name);
}
varsub=newSubTypes();
sub.getProperty();// true
sub.getName();// lisp
借用构造函数继承
function SuperTypes(name) {
this.name = name;
}
function SubTypes(name){
// 继承了SuperTypes，通过call来实现继承
SuperTypes.call(this, name);
}
SubTypes.prototype.getName = function() {
console.log(this.name);
}
var sub = new SubTypes('lisp');
sub.getName(); // lisp
组合继承
function SuperTypes(name) {
this.name = name;
this.colors = ['red', 'blue'];
}
SuperTypes.prototype.getColor = function() {
console.log(this.colors);
}
function SubTypes(name) {
// 借用构造函数继承
SuperTypes.call(this, name);
}
// 原型链继承
SubTypes.prototype = new SuperTypes();
SubTypes.prototype.getName = function() {
console.log(this.name);
}
var sub = new SubTypes('lisp');
sub.colors.push('pink');
sub.getColor(); // ['red', 'blue', 'pink']
sub.getName(); // lisp
原型试继承
function object(o) {
function F() { }
F.prototype = o;
return new F();
}
var person = {
name: 'lisp',
age: 22
};
var otherPerson = object(person); // 相当于进行了一次浅复制
console.log(otherPerson.name); // lisp
// Object.create()方法规范化了浅复制
var anotherPerson = Object.create(person);
console.log(anotherPerson.name); // lisp
寄生组合式继承
function inheritPrototype(subType, superType) {
var property = Object.create(superType.prototype);
// 将property的指针指向subType
property.constructor = subType;
// property赋值给subType的原型
subType.prototype = property;
}
function SuperTypes(name) {
this.name = name;
this.colors = ['red', 'blue'];
}
SuperTypes.prototype.getColor = function() {
console.log(this.colors);
}
function SubTypes(name) {
// 借用构造函数继承
SuperTypes.call(this, name);
}
// 原型链继承
// SubTypes.prototype = new SuperTypes();
inheritPrototype(SubTypes, SuperTypes);
SubTypes.prototype.getName = function() {
console.log(this.name);
}
var sub = new SubTypes('lisp');
sub.colors.push('pink');
sub.getColor(); // ['red', 'blue', 'pink']
sub.getName(); // lisp
