## 概述

`Symbol.hasInstance 用于判断某对象是否为某构造器的实例。` 因此你可以用它自定义 `instanceof` 操作符在某个类上的行为。

`Symbol.hasInstance` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 示例

`例如，你可以这样来自定义` MyArray 的 `instanceof` 行为:

    class MyArray {
      static [Symbol.hasInstance](instance) {
        return Array.isArray(instance);
      }
    }
    console.log([] instanceof MyArray); // true

## 规范

文档 | 状态 | 备注
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) Symbol.hasInstance | Standard | Initial definition.
ECMAScript Latest Draft (ECMA-262) Symbol.hasInstance | Draft |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | 51 | 50 (50) | 未实现 | ? | ?

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | ? | ? | 50.0 (50) | 未实现 | ? | ?

## 参考

- `instanceof`