JAVASCRIPT实现继承的几种方式
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对象冒充(多继承):
a. 代码:function ClassA(sColor) { this.color = sColor; this.sayColor = function () { console.log(this.color); }; } function ClassB(sName) { this.name = sName; this.sayName = function () { console.log(this.name); }; } function ClassC(sColor, sName) { this.newMethod = ClassA; this.newMethod(sColor); delete this.newMethod; this.newMethod = ClassB; this.newMethod(sName); delete this.newMethod; } var objA = new ClassA("blue"); var objC = new ClassC("red", "John"); objA.sayColor(); objC.sayColor(); objC.sayName();
b. 输出:
blue red John
- call()方法(推荐):
a. 代码:function ClassA(sColor) { this.color = sColor; this.sayColor = function () { console.log(this.color); }; } function ClassB(sName) { this.name = sName; this.sayName = function () { console.log(this.name); }; } function ClassC(sColor, sName) { ClassA.call(this,sColor) ClassB.call(this,sName) } var objA = new ClassA("blue"); var objC = new ClassC("red", "John"); objA.sayColor(); objC.sayColor(); objC.sayName();
b. 输出:
blue red John
- apply()方法(推荐):
a. 代码:function ClassA(sColor) { this.color = sColor; this.sayColor = function () { console.log(this.color); }; } function ClassB(sName) { this.name = sName; this.sayName = function () { console.log(this.name); }; } function ClassC(sColor, sName) { ClassA.apply(this,new Array(sColor)) ClassB.apply(this,new Array(sName)) } var objA = new ClassA("blue"); var objC = new ClassC("red", "John"); objA.sayColor(); objC.sayColor(); objC.sayName();
b. 输出:
blue red John
- 原型链(单继承):
a. 代码:function ClassA(color) { this.color = color this.sayColor = function () { console.log(this.color); }; } function ClassB(name) { this.name = name this.sayName = function () { console.log(this.name); }; } ClassB.prototype = new ClassA("red"); var objA = new ClassA("blue"); var objB = new ClassB("John"); objA.sayColor(); objB.sayColor(); objB.sayName();
b. 输出:
blue red John
- 混用对象冒充与原型链(多继承):
a. 代码:function ClassA(sColor) { this.color = sColor; this.sayColor = function(){ console.log(this.color) } } function ClassB(sName) { this.name = sName; this.sayName = function(){ console.log(this.name) } } function ClassC(sColor, sName) { ClassA.call(this, sColor); ClassB.call(this, sName); } ClassC.prototype = new ClassA(); ClassC.prototype = new ClassB(); var objA = new ClassA("blue"); var objC = new ClassC("red", "John"); objA.sayColor(); objC.sayColor(); objC.sayName();
b. 输出:
blue red John
- 说明:
推荐使用call()方法或apply()方法
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