call和apply继承
<script>
// let obj1={
// a:'tom'
// }
// let obj2={
// a:'tom'
// }
// function f(){
// console.log('this指向',this);
// return this.a;
// }
// console.log(f.call(obj1));
/* 构造函数绑定实现继承 */
/* 在子类内部调用父类的方法 通过call()或apply()方法 */
/* function Person(){
this.foot=2
}
function Student(){
// Person.call(this)
Person.apply(this)
}
console.log( new Student() ); */
function Car(gang, bsx) {
this.gang = gang;
this.bsx = bsx;
this.lunzi = 4;
}
function Fn(name, price, gang, bsx) {
Car.call(this, gang, bsx);
// Car.apply(this,[gang,bsx]);
this.name = name;
this.price = price;
this.print = function () {
document.write(`${this.name}--${this.price}--
${this.lunzi}个轮子--${this.gang}缸--${this.bsx}变速箱`);
}
}
let car1 = new Fn('奔驰', '100w', 4, 'cvt');
// console.log(car1);
console.log(new Fn());
// console.log(new Car());
car1.print();
</script>
组合继承
<script>
// function Person() {
// /* 实例属性 */
// this.head = 1;
// this.foot = 2;
// }
// /* 原型属性和方法 */
// Person.prototype.weight='70kg';
// Person.prototype.eat = function () {
// console.log('会吃饭');
// }
// function Student() {
// Person.call(this);
// }
// Student.prototype = new Person();
// Student.prototype.constructor = Student;
// let stu1 = new Student();
// console.log(stu1);
function Car() {
this.lunzi = 4;
}
Car.prototype.run = function () {
document.write(`${this.name}--${this.lunzi}个轮子--会跑赛道`);
}
function Bc(name) {
Car.call(this);
this.name = name;
}
Bc.prototype = new Car();
Bc.prototype.constructor = Bc;
let bc1 = new Bc('奔驰');
console.log(bc1);
bc1.run();
</script>
拷贝继承
<script>
// function Person(){}
// Person.prototype.head=1;
// Person.prototype.foot=2;
// Person.prototype.eat=function(){
// document.write('eat eat eat');
// }
// function Student(){}
function extend(child, parent) {
for (var i in parent.prototype) {
child.prototype[i] = parent.prototype[i];
}
}
// extend(Student,Person);
// let stu=new Student();
// console.log(stu);
// stu.eat()
function Car() { }
Car.prototype.lunzi = 4;
Car.prototype.print = function () {
document.write(`${this.name}--${this.lunzi}个轮子--会跑赛道`);
}
function Bc(name) {
this.name = name;
}
extend(Bc, Car);
let bc = new Bc('奔驰');
bc.print();
</script>
