面向对象
Posted 欢如平生
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1.封装
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>封装1</title> </head> <body> </body> <script> // 1.普通的对象 var cat = { name: ‘jane‘, color: ‘yellow‘ } console.log(cat) // 2.函数生成 function Cat (name, color) { return { name: name, color: color } } var cat1 = Cat(‘one‘, ‘green‘) var cat2 = Cat(‘two‘, ‘yellow‘) console.log(cat1,cat2) // 3.构造函数 function Cat2 (name, color) { this.name = name this.color = color } Cat2.prototype.type="猫科动物" Cat2.prototype.eat = function() {console.log(‘吃老鼠‘)} var cat3 =new Cat2(‘three‘, ‘green‘) var cat4 =new Cat2(‘four‘, ‘yellow‘) console.log(cat3,cat4) console.log(cat3.constructor) console.log(cat3.eat) // 吃老鼠 // 4.Prototype模式的验证方法 // 4.1 isPrototypeOf() 判断某个实例对象个某个实例之间的关系 alert(Cat2.prototype.isPrototypeOf(cat3)) // 4.2 hasOwnProperty 判断某个属性是本地属性还是继承自prototype alert(cat3.hasOwnProperty("name")) alert(cat3.hasOwnProperty("eat")) // 4.3 in 判断某个实例是否含有某个属性，不管是不是本地属性,in也可以遍历某个对象的所有属性 alert("name" in cat3) for(var prop in cat) { console.log(prop) } </script> </html>
2.继承
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>继承</title> </head> <body> </body> <script> function Animal() { this.species = "动物" } function Cat (name, color) { this.name = name this.color = color } console.log(Animal()) // 1. call/apply,将父对象的构造函数绑定在子对象上,直接改变this的指向 function Cat(name, color) { Animal.apply(this, arguments) this.name = name this.color = color } var cat1 = new Cat(‘大黄‘, ‘蓝色‘) console.log(cat1.species) // 2. prototype Cat.prototype = new Animal() Cat.prototype.constructor = Cat var cat2 = new Cat(‘大黄‘, ‘蓝色‘) console.log(cat2.species) // 3. 直接继承prototype function Animal1 () {} Animal1.prototype.species = "动物" Cat.prototype = Animal1.prototype Cat.prototype.constructor = Cat var cat3 = new Cat(‘大黄‘, ‘蓝色‘) console.log(cat3.species) console.log(Animal1.prototype.constructor) // 4. 空对象继承 function extend(Child, Parent) { var F = function(){}; F.prototype = Parent.prototype; Child.prototype = new F(); Child.prototype.constructor = Child; Child.uber = Parent.prototype; } // 5.拷贝继承 function extend2 (Child, Partent) { var p = Partent.prototype var q = Child.prototype for (var prop in p) { q[prop] = p[prop] } q.uber = p } </script> </html>
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