定义父类和子类的继承关系

//声明父类function SuperClass(){    this.superValue = true;}//为父类添加共有方法SuperClass.prototype.getSuperValue=function(){    return this.superValue;}//声明子类function SubClass(){    this.subValue = false;}//继承父类SubClass.prototype = new SuperClass();SubClass.prototype.getSubValue = function(){    return this.subValue;}var instance = new SubClass();console.log(instance.getSuperValue());console.log(instance.getSubValue());

  console.log(instance instanceof SuperClass);

  console.log(instance instanceof SubClass);

  console.log(SubClass instanceof SuperClass);

  console.log(SubClass.prototype instanceof SuperClass);

  console.log(instance instanceof Object);

将父类的实例赋给子类的prototype就实现了 类的继承

类关系的检测

结果如下：

 

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参考列表

1.《JavaScript设计模式》作者张荣铭