Object.freeze()提高Vue.js中大型列表的性能【翻译+解读】这个网站主打，简洁快速的分享一些关于Vue的

介绍

文章链接：vuedose.tips/tips/improv…
这个网站主打，简洁快速的分享一些关于Vue的tips。每周更新，会发到邮件上。正文是翻译，解读是我自己的相关理解。

正文

在开发过程中，我们经常需要获取一些对象，像users信息，列表items，文章信息等等，但是我们不需要去修改这些信息。我们只是把这些信息展示出来，或者放在vuex中state里面。如下代码所示

export default {
  data: () => ({
    users: {}
  }),
  async created() {
    const users = await axios.get("/api/users");
    this.users = users;
  }
};

Vue默认会对每个数组数据的每一层属性，添加双向数据绑定机制。当数组对象非常庞大时，消耗在这上面的双向数据绑定就越多。因为，在这种场景下，我们可以通过阻止Vue对这些数据添加双向数据绑定来提高一些性能。Object.freeze()就能做到这点。

export default {
  data: () => ({
    users: {}
  }),
  async created() {
    const users = await axios.get("/api/users");
    this.users = Object.freeze(users);
  }
};

记住在Vuex中也可这样使用

const mutations = {
  setUsers(state, users) {
    state.users = Object.freeze(users);
  }
};

如果你需要改变这些信息，你可以创建一个新的被冻结的数组并赋值给他

state.users = Object.freeze([...state.users, user]);

解读

来深究一下为什么Object.freeze()方法可以做到阻止Vue添加双向数据绑定机制

大家应该都知道Vue是通过Object.defineProperty()来修改属性描述符中的setter和getter的，在getter中收集依赖，在setter的时候触发依赖。
在ES5开始，所有的属性都有了属性描述符。决定是否可以修改一个属性的描述符有两个：

是Writable：决定是否可以修改属性的值；
另一个是Configurable：决定是否可以使用Object.defineProperty()来修改属性描述符，并且也会禁止删除这个属性；

当这两个描述符同时为false时，意味着这个属性完全是一个常量，Vue不能通过Object.defineProperty()来添加双向数据绑定。收集不了依赖，也就做不了双向数据绑定，就少添加很多watcher实例。

执行Object.freeze()会执行Object.seal()并吧所有的属性的writable设置成false。
Object.seal()则会调用Object.preventExtensions()并把configurable设为false。
Object.preventExtensions()则会禁止对象添加新的属性。
这一趟下来，基本上变成一个永久性不能加查删的对象了。我做了个草图，大家康康，帮助理解下。

最后还有一个疑问，`state.users = Object.freeze([...state.users, user]);`会不会触发视图更新。

答案是会。我亲自写demo测试过，重新赋值会触发更新。
是为什么呢？
其实很简单，users变量是定义在data中的，在Vue初始化initState的时候，会遍历data中的所有属性，添加监听。也就是说我们冻结的是users里面所有的属性，并没有冻结Vue中data，所以替换users会触发双向数据绑定。

翻译或者理解有纰漏的，欢迎大家帮忙指正~

受评论提醒，写了个很简单的demo来测试Object.freeze()能提升多少性能我取了平时工作中一个返回树形结构数据的接口中返回的数据来做测试代码，和结果如下

    <div id="app">
      {{msg}}
    </div>
const param = 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new  Vue({
  el: '#app',
  data: {
    msg: 'sdfsd',
    data1: null,
    data2: null,
  },
  mounted() {
    this.data2 = new Date().getTime()
    console.log(new Date().getTime())
    console.log((this.data2-this.data1))
  },
  created(){
    this.data1 = new Date().getTime()
    console.log(new Date().getTime())
    this.msg = Object.freeze(param.data);
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这个结果可能会和电脑性能有关，但是还是能看到加Object.freeze()和不加的区别，我电脑测试会在20左右毫秒的差距。但是一般项目中会有很多这样的接口返回数据，积少成多，所以还是可以值得在日常开发中实践。

Object.freeze()提高Vue.js中大型列表的性能【翻译+解读】

介绍

正文

解读

来深究一下为什么Object.freeze()方法可以做到阻止Vue添加双向数据绑定机制

最后还有一个疑问，state.users = Object.freeze([...state.users, user]);会不会触发视图更新。

最后还有一个疑问，`state.users = Object.freeze([...state.users, user]);`会不会触发视图更新。