我们可以在javascript中将通用对象转换为自定义对象类型吗? [英] Can we cast a generic object to a custom object type in javascript?

问题描述

例如，我在代码中的某个位置已经有此对象，它是一个通用对象:

For example, I already have this object somewhere in the code, it is a generic object:

var person1={lastName:"Freeman",firstName:"Gordon"};

我有一个Person对象的构造函数:

I have the constructor for a Person object:

function Person(){
 this.getFullName=function(){
  return this.lastName + ' ' + this.firstName;
 }
}

有没有简单的语法可以让我们将person1转换为Person类型的对象?

Is there a simple syntax that allows us to convert person1 to an object of type Person?

推荐答案

@PeterOlson的答案可能会在今天恢复，但是看起来Object.create已更改. 我会使用@ user166390在评论中说的复制构造方法.
我取消这篇文章的原因是因为我需要这样的实现.

The answer of @PeterOlson may be worked back in the day but it looks like Object.create is changed. I would go for the copy-constructor way like @user166390 said in the comments.
The reason I necromanced this post is because I needed such implementation.

如今，我们可以使用 Object.assign ( @SayanPal解决方案的信用额)& ES6语法:

Nowadays we can use Object.assign (credits to @SayanPal solution) & ES6 syntax:

class Person {
  constructor(obj) {
    obj && Object.assign(this, obj);
  }

  getFullName() {
    return `${this.lastName} ${this.firstName}`;
  }
}

用法:

const newPerson = new Person(person1)
newPerson.getFullName() // -> Freeman Gordon

下面的ES5答案

function Person(obj) {
    for(var prop in obj){
        // for safety you can use the hasOwnProperty function
        this[prop] = obj[prop];
    }
}

用法:

var newPerson = new Person(person1);
console.log(newPerson.getFullName()); // -> Freeman Gordon

使用较短的1.5衬纸:

Using a shorter version, 1.5 liner:

function Person(){
    if(arguments[0]) for(var prop in arguments[0]) this[prop] = arguments[0][prop];
}

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