René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"阿里：如何判断两个变量相等","articleBody":"使用 API： `Object.is()` 方法判断两个值是否为同一个值\r\n\r\n```js\r\nObject.is(x, y)\r\n```\r\n\r\nPolyfill：\r\n\r\n```js\r\nif (!Object.is) {\r\n  Object.is = function(x, y) {\r\n    // SameValue algorithm\r\n    if (x === y) { // Steps 1-5, 7-10\r\n      // Steps 6.b-6.e: +0 != -0\r\n      return x !== 0 || 1 / x === 1 / y;\r\n    } else {\r\n      // Step 6.a: NaN == NaN\r\n      return x !== x \u0026\u0026 y !== y;\r\n    }\r\n  };\r\n}\r\n```\r\n\r\n#### 扩展：\r\n\r\nJavaScript提供三种不同的值比较操作：\r\n\r\n- 严格相等比较：使用 [===](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Identity) \r\n- 抽象相等比较：使用 [==](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators#Equality)\r\n- 以及 [`Object.is`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is) （ECMAScript 2015/ ES6 新特性）：同值相等\r\n\r\n其中：\r\n\r\n-  ===：进行相同的比较，不进行类型转换 (如果类型不同, 只是总会返回 false )\r\n- ==：执行类型转换，比较两个值是否相等\r\n- `Object.is` ：与 === 相同，但是对于 `NaN` 和 `-0` 和 `+0` 进行特殊处理， `Object.is(NaN, NaN)` 为 `true` ， `Object.is(+0, -0)` 为 `false`","author":{"url":"https://github.com/sisterAn","@type":"Person","name":"sisterAn"},"datePublished":"2020-10-12T22:59:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/116/JavaScript-Algorithms/issues/116"}