title: ESLint(no-prototype-builtins)
author: Gamehu
tags:
  - ESLint
categories:
  - 前端
date: 2020-11-24 14:56:00

---

  // eslint-disable-next-line no-prototype-builtins

​    if (!a.hasOwnProperty(key) || !b.hasOwnProperty(key)) return 0;



[no-prototype-builtins - Rules - ESLint - Pluggable JavaScript linter](https://eslint.org/docs/rules/no-prototype-builtins)

## Rule Details

This rule disallows calling some `Object.prototype` methods directly on object instances.

Examples of **incorrect** code for this rule:

```
/*eslint no-prototype-builtins: "error"*/

var hasBarProperty = foo.hasOwnProperty("bar");

var isPrototypeOfBar = foo.isPrototypeOf(bar);

var barIsEnumerable = foo.propertyIsEnumerable("bar");
```

Examples of **correct** code for this rule:

```
/*eslint no-prototype-builtins: "error"*/

var hasBarProperty = Object.prototype.hasOwnProperty.call(foo, "bar");

var isPrototypeOfBar = Object.prototype.isPrototypeOf.call(foo, bar);

var barIsEnumerable = {}.propertyIsEnumerable.call(foo, "bar");
```