javascript - 我们可以在 javascript 中将通用对象转换为自定义对象类型吗？

Question

例如，我在代码的某处已经有了这个对象，它是一个通用对象:

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

我有一个 Person 对象的构造函数:

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

是否有一个简单的语法允许我们将 person1 转换为 Person 类型的对象？

Answer 1

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.

现在我们可以使用 Object.assign (归功于@SayanPal 解决方案)和 ES6 语法:

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

使用较短的版本，1.5 衬垫:

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

jsfiddle