Question

在我阅读了很多关于JavaScript原型的帖子之后，在写完第一行代码后的第二天，我不得不问 - 有没有人知道如何制作一个合适的JavaScript原型链？如何将这个非常简单的东西（？）原型化：

洲
国家
区域
市
邻

然后这个示例代码可以工作：

var södermalm = sweden["södermalm"];
console.info(södermalm.neighbourhood + " is located on the continent " + södermalm.continent);

还有这个：

if (!sweden.neighbourhood) console.warn("Sweden is a country")

Answer 1

＆＃13;

function Continent(nameOfContinent) {
  this.continent = nameOfContinent;
}
Continent.prototype.getType = function () { return 'Continent'; }

function Country(nameOfCountry, nameOfContinent) {
  Continent.call(this, nameOfContinent);
  this.country = nameOfCountry;
}
Country.prototype = new Continent();
Country.prototype.getType = function () { return 'Country'; }


function Region(nameOfRegion, nameOfCountry, nameOfContinent) {
  Country.call(this, nameOfCountry, nameOfContinent);
  this.region = nameOfRegion;
}
Region.prototype = new Country();
Region.prototype.getType = function () { return 'Region'; }


function City(nameOfCity, nameOfRegion, nameOfCountry, nameOfContinent) {
  Region.call(this, nameOfRegion, nameOfCountry, nameOfContinent);
  this.city = nameOfCity;
}
City.prototype = new Region();
City.prototype.getType = function () { return 'City'; }



function Neighbourhood(nameOfNeighbourhood, nameOfCity, nameOfRegion, nameOfCountry, nameOfContinent) {
  City.call(this, nameOfCity, nameOfRegion, nameOfCountry, nameOfContinent);
  this.neighbourHood = nameOfNeighbourhood;
}
Neighbourhood.prototype = new City();
Neighbourhood.prototype.getType = function () { return 'Neighbourhood'; }


let dehradun = new City('dehradun', 'uttarakhand', 'india', 'asia');
let divyaVihar = new Neighbourhood('divya vihar', 'dehradun', 'uttarakhand', 'india', 'asia');

console.log(divyaVihar);

console.log(divyaVihar.neighbourHood + " is located on the continent " + divyaVihar.continent);

console.log(divyaVihar instanceof Neighbourhood);

if(!(dehradun instanceof Neighbourhood)) {
  console.log(dehradun.getType())
}

＆＃13;

如何完成JavaScript原型设计？

1 个答案: