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创建一个百分百的纯对象，这个对象不会继承object的任何属性和方法，比如constructor，toString等
const pureObject = Object.create(null);
console.log(pureObject); //=> {}
console.log(pureObject.constructor); //=> undefined
console.log(pureObject.toString); //=> undefined
console.log(pureObject.hasOwnProperty); //=> undefined
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转播
