---
id: 587d7daf367417b2b2512b7d
title: Iterate Over All Properties
challengeType: 1
videoUrl: ''
localeTitle: 迭代所有属性
---
## Description
您现在已经看到了两种属性： own属性和prototype属性。 Own属性直接在对象实例本身上定义。和prototype属性所定义的prototype 。 function Bird（name）{
this.name = name; //拥有财产
}
Bird.prototype.numLegs = 2; //原型属性
让鸭子=新鸟（“唐纳德”）;
以下是如何将duck own属性添加到数组ownProps和prototype属性到数组prototypeProps ： 让ownProps = [];
让prototypeProps = [];
for（let duck in duck）{
if（duck.hasOwnProperty（property））{
ownProps.push（属性）;
} else {
prototypeProps.push（属性）;
}
}
的console.log（ownProps）; //打印[“名称”]
的console.log（prototypeProps）; //打印[“numLegs”]
## Instructions
所有添加own的属性beagle到数组ownProps 。将Dog所有prototype属性添加到数组prototypeProps 。
## Tests
```yml
tests:
- text: ownProps数组应包含"name" 。
testString: 'assert(ownProps.indexOf("name") !== -1, "The ownProps array should include "name".");'
- text: prototypeProps数组应该包含"numLegs" 。
testString: 'assert(prototypeProps.indexOf("numLegs") !== -1, "The prototypeProps array should include "numLegs".");'
- text: 无需使用内置方法Object.keys()即可解决此挑战。
testString: 'assert(!/\Object.keys/.test(code), "Solve this challenge without using the built in method Object.keys().");'
```
## Challenge Seed
```js
function Dog(name) {
this.name = name;
}
Dog.prototype.numLegs = 4;
let beagle = new Dog("Snoopy");
let ownProps = [];
let prototypeProps = [];
// Add your code below this line
```
## Solution
```js
// solution required
```