对象扩展 ES6 新增了一些 Object 对象的方法 1) Object.is 比较两个值是否严格相等,与『===』行为基本一致(+0 与 NaN) 2) Object.assign 对象的合并,将源对象的所有可枚举属性,复制到目标对象 3) __proto__、setPrototypeOf、 setPrototypeOf 可以直接设置对象的原型
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>对象方法扩展</title> </head> <body> <script> //1. Object.is 判断两个值是否完全相等 console.log(Object.is(120, 120));// === console.log(Object.is(NaN, NaN));// === console.log(NaN === NaN);// === //2. Object.assign 对象的合并 const config1 = { host: 'localhost', port: 3306, name: 'root', pass: 'root', test: 'test' }; const config2 = { host: 'http://atguigu.com', port: 33060, name: 'atguigu.com', pass: 'iloveyou', test2: 'test2' } // 后面的属性值会替换前面的属性值 console.log(Object.assign(config1, config2)); console.log("Object.setPrototypeOf"); //3. Object.setPrototypeOf 设置原型对象 Object.getPrototypeof const school = { name: '尚硅谷' } const cities = { xiaoqu: ['北京','上海','深圳'] } Object.setPrototypeOf(school, cities); console.log(Object.getPrototypeOf(school)); console.log(school); </script> </body> </html>
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标签:ES6,setPrototypeOf,console,log,对象,NaN,Object,扩展 From: https://www.cnblogs.com/anjingdian/p/16908688.html