历史 String.prototype.includes()

翻译了 Polyfill 的描述

includes() 方法的中文版落后于已审核通过的英文版太久。大量内容更新（暂时先把英文挪过来）

Fixed title

+tags (for lateral quick links)Web/JavaScript/Reference/Global_Objects/String/contains Web/JavaScript/Reference/Global_Objects/String/includes

+tags (for lateral quick links)

Web/JavaScript/Reference/String/contains Web/JavaScript/Reference/Global_Objects/String/contains

JavaScript/Reference/String/contains Web/JavaScript/Reference/String/contains

JS-ref/String/contains JavaScript/Reference/String/contains

JavaScript/Reference/Global_Objects/String/contains JS-ref/String/contains