搞不懂for in循环中，key的值

Question

  用axios提取出本地的json文件，格式如下    "Merch": {"hamburger": {  "1": {    "goodsImg": "http://7xjyw1.com1.z0.glb.clouddn.com/pos001.jpg",    "goodsName": "香辣鸡腿堡",    "price": 18  },  "2": {    "goodsImg": "http://7xjyw1.com1.z0.glb.clouddn.com/pos002.jpg",    "goodsName": "田园鸡腿堡",    "price": 15  }},"friedChicken": {  "3": {    "goodsImg": "http://7xjyw1.com1.z0.glb.clouddn.com/pos003.jpg",    "goodsName": "大包薯条",    "price": 18  },  "4": {    "goodsImg": "http://7xjyw1.com1.z0.glb.clouddn.com/pos002.jpg",    "goodsName": "脆皮炸鸡腿",    "price": 20  }｝axios  .get("/static/data/Merch.json")  .then(response => {    let Merchs = response.data.Merch;    for (let key in Merchs) {      let eph = Merchs[key];      this.typeMerch.key=eph;    }          })    console.log(key),打印出来的是hamburger和frideChicken；  但是下面想添加进属性里，key却变成了字符串  为什么啊  有大大可以解释一下吗    

Answer 1

this.typeMerch[key]=eph;这样？其实我没大看懂问题。。。