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                >[success] # 新增 1. **getOwnPropertyDescriptors**方法用來獲取一個對象的所有自身屬性的描述符 ~~~ var obj = { name: 'w', age: 16, } console.log(Object.getOwnPropertyDescriptors(obj)) /** 打印結果 { name: { value: 'w', writable: true, enumerable: true, configurable: true }, age: { value: 16, writable: true, enumerable: true, configurable: true } } */ ~~~ 2. **preventExtensions**給一個對象添加新的屬性會失敗(在嚴格模式下會報錯) ~~~ var obj = { name: 'w', age: 16, } Object.preventExtensions(obj) obj.zzz = 12 // 寫不進去 console.log(obj) // { name: 'w', age: 16 } ~~~ 3. **seal** 密封對象,不允許配置和刪除屬性,實際是調用**preventExtensions**,并且將現有屬性的**configurable:false** ~~~ var obj = { name: 'w', age: 16, } Object.seal(obj) obj.zzz = 12 // 寫不進去 delete obj.name // 不能刪除 console.log(obj) // { name: 'w', age: 16 } ~~~ 4. **freeze** 凍結對象,不允許修改現有屬性,實際上是調用**seal**,并且將現有屬性的**writable: false**
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