在javascript中检查自定义对象的类型

Question

I have the following object:

var car = {
  doors: 4
  wheels: 4
}

This is used in many files, is there a way that it can be checked easily across the entire codebase?

function insertCar(car) {
  if (!isCar(car)) {
    console.log('not a car')
  }
}

Answer 1

If I understood you correctly, instaceof will be the answer. You can do something like this:

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}
var mycar = new Car('Honda', 'Accord', 1998);
var a = mycar instanceof Car;    // returns true
var b = mycar instanceof Object; // returns true

As for exporting and importing , you need to define your object in one file and export it:

module.exports = function Car(make, model, year) {
 //...
}

Then you import it in whichever file you want with

import Car from 'components/car' 

where components/car is an example of your file where object Car is exported from, in this case Car.js which is located in directory components .