无涯教程-Object.seal()函数

Object.seal(obj)

const obj1 = { property1: Marry};
        const obj2 = Object.seal(obj1);
      //prevents other code from deleting properties of an object.
        obj2.property1 = carry;
        console.log(obj2.property1);

 const object1 = {
  property1: 29
};
Object.seal(object1);
// Prevents other code from deleting properties of an object.
object1.property1 =45;
console.log(object1.property1);
delete object1.property1;
  //cannot delete when sealed

const object1 = {
  property1: 42
};
Object.seal(object1);
object1.property1 = 45;
console.log(object1.property1);

delete object1.property1;//cannot delete when sealed
console.log(object1.property1);

const object2 = {
  property2: 45};
object2.property2 =67;
console.log(object2.property2);