javascript - jquery 从对象创建原型(prototype)

Question

我想在创建原型(prototype)时稍微作弊

例如

var person = {
   name: 'John',
   age: 110,
   gender: 'm',
   ...
};

var employee = new Person(person);

function Person(args) {
   $.each(args, function(key, value) {
      this[key] = value; // Cannot create property 'key' on number
   });
}

console.log(employee.age);

在 PHP 中可以这样做

function __construct() {
    $args = func_get_arg(0);            
    foreach ($args as $key => $value) {
        $this->$key = $value;
    }
    return $this;
}

Answer 1

问题是“this”指的是每个函数而不是实际的 Person您可以将其更改为箭头功能，它将起作用

var person = {
   name: 'John',
   age: 110,
   gender: 'm',
   ...
};

var employee = new Person(person);

function Person(args) {
   $.each(args, (key, value) => { //changed to arrow function to keep this in the same scope
      this[key] = value; // Cannot create property 'key' on number
   });
}

console.log(employee.age);