1.object.is()判断两个值是否相等 <script type="text/javascript">var flag1 = Object.is('foo', 'foo');console.log(flag1);//truevar flag2 = Object.is('', '');console.log(flag2);//truevar flag3 = O

序 ECMAScript is an object-oriented programming language for performing computations and manipulating computational objects within a host environment. — 摘自《ECMAScript 2018 Language Specification》. 最近在看 ES 规范，越看越觉得这是一门神奇的语言