1. Object.is(v1, v2) : 判断2个数据是否完全相等  2. Object.assign(target, source1, source2..) : 将源对象的属性复制到目标对象上  3. __proto__属性 : 隐式原型属性  4. 增强的对象写法 console.log('abc'==='abc'); console.log(Object.is('abc', 'abc')); console.log(0===-0); console.log(Object.is(0, -0)); console.log(NaN===NaN); console.log(Object.is(NaN, NaN)); var target = {a: 1, b: 1}; var source1 = {b: 2, c: 2}; var source2 = {c: 3, d: 4}; Object.assign(target, source1, source2); console.log(target); var obj1 = {
      name : 'Tom',     setName : function (name) {
          this.name = name;     } }; var obj2 = {}; obj2.__proto__ = obj1; obj2.setName('Jack'); console.log(obj2.name); function getPoint() {
      var x = 1;     var y = 2;     return {x, y};     return {x:x,y:y };//(传统对象写法,key:value) } console.log(getPoint());