#正式發布的ES6中已經封裝實作了其他OO語言中的#繼承##形式，Class Extends#，這裡主要記錄js的原型繼承和借用建構子繼承
##一一、原型鏈繼承原型鏈繼承的問題function Super(){
this.name="小明";
}
Super.prototype.sayName = function(){
alert(this.name)
};function Sub(){}
Sub.prototype = new Super();var instance = new Sub();
instance.sayName();//小明1234567891011登入後複製
//當超類別中包含引用類型屬性值時，其中一個子類別的多個實例中，只要其中一個實例引用屬性只發生修改一個修改，其他實例的引用類型屬性值也會立即發生改變//原因是超類別的屬性變成子類別的原型屬性function Super(){this.name="小明"; this.friends = ['小紅','小強'];
}
Super.prototype.sayName = function(){
alert(this.name)
};function Sub(){}
Sub.prototype = new Super();var instance1 = new Sub();var instance2 = new Sub();
instance1.friends.push('张三');
console.log(instance1.friends);//["小红", "小强", "张三"]console.log(instance2.friends);//["小红", "小强", "张三"]1234567891011121314151617二、借用建構子繼承
function Super(){this.name="小明"; this.friends = ['小红','小强'];
}
Super.prototype.sayName = function(){
alert(this.name)
};function Sub(){
Super.call(this);
}var instance1 = new Sub();var instance2 = new Sub();
instance1.friends.push('张三');
console.log(instance1.friends);//["小红", "小强", "张三"]console.log(instance2.friends);//["小红", "小强"]12345678910111213141516屬性與方法
function Super(){this.name="小明"; this.friends = ['小红','小强'];
}
Super.prototype.sayName = function(){
alert(this.name)
};function Sub(){
Super.call(this);
}
Sub.prototype = new Super();var instance1 = new Sub();var instance2 = new Sub();
instance1.friends.push('张三');
console.log(instance1.friends);//["小红", "小强", "张三"]console.log(instance2.friends);//["小红", "小强"]instance1.sayName();//小明instance2.sayName();//小明12345678910111213141516171819//组合式继承中，超类的构造函数将被调用两次function Super(){this.name="小明"; this.friends = ['小红','小强'];
}
Super.prototype.sayName = function(){
alert(this.name)
};function Sub(){
Super.call(this);//第二次调用}
Sub.prototype = new Super();//第一次调用var instance = new Sub();1234567891011121314createAnother(original){
var clone = Object(original);//创建一个新对象，original的副本
clone.sayName = function(){ //对象的增强，添加额外的方法
alert('hi');
}
return
clone;
}var person = {
name:'小明',
friends:['小红','小强']
}var person1 = createAnother(person);var person2 = createAnother(person);
person1.friends.push('张三');
console.log(person.friends);//["小红", "小强", "张三"]console.log(person1.friends);//["小红", "小强", "张三"]console.log(person2.friends);//["小红", "小强", "张三"]123456789101112131415161718//寄生组合式继承解决了组合式继承调用两次超类构造函数的问题function inheritPrototype(sub,superr){var prototype = Object.create(superr.prototype);//ES5中
创建对象
副本的方法
prototype.constructor = superr; //弥补重写原型失去的默认constructor属性
sub.prototype = prototype;
}function Super(name){
this.name = name; this.friends = ['小红','小强'];
}
Super.prototype.sayName = function(){
alert(this.name);
}function Sub(name){
Super.call(this,name);
}
inheritPrototype(Sub,Super);var person1 = new Sub('小明');var person2 = new Sub('小华');
person1.friends.push('张三');
console.log(person1.friends);//["小红", "小强", "张三"]console.log(person2.friends);//["小红", "小强"]console.log(person1.sayName());//小明console.log(person2.sayName());//小华以上是在js 中的有哪幾種繼承方法的詳細內容。更多資訊請關注PHP中文網其他相關文章！
