小编sto*_*fel的帖子

我偶然发现了这个Array.prototype.includes的polyfill. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes.是否有理由在第21,22行将变量与自身进行比较？

if (searchElement === currentElement ||
         (searchElement !== searchElement && currentElement !== currentElement)) {
  return true;
}