js不可变的对象是如何创建的

maxSpeed: 155,

batteryLife: 300,

weight: 2300

};

Object.preventExtensions(myTesla);

Object.isExtensible(myTesla); // false

myTesla.color = 'blue';

console.log(myTesla.color) // undefined

Object.seal(myTesla);

Object.isSealed(myTesla); // true

myTesla.color = 'blue';

console.log(myTesla.color); // undefined

delete myTesla.batteryLife; // false

console.log(myTesla.batteryLife); // 300

Object.defineProperty(myTesla, 'batteryLife'); // TypeError: Cannot redefine property: batteryLife

Object.freeze(myTesla);

Object.isFrozen(myTesla); // true

myTesla.color = 'blue';

console.log(myTesla.color); // undefined

delete myTesla.batteryLife;

console.log(myTesla.batteryLife); // 300

Object.defineProperty(myTesla, 'batteryLife'); // TypeError: Cannot redefine property: batteryLife

myTesla.batteryLife = 400;

console.log(myTesla.batteryLife); // 300