var fruit = {
    name : ‘苹果‘,
    desc : ‘红富士‘
};
//
console.log(‘isFrozen‘,Object.isFrozen(fruit)); // false
Object.freeze(fruit);
console.log(‘isFrozen‘,Object.isFrozen(fruit)); // true
//
fruit.address = ‘烟台‘;
console.log(‘添加address属性‘,fruit);
//
fruit.desc = ‘金帅‘;
console.log(‘修改属性‘,fruit);
// 
delete(fruit.desc);
console.log(‘删除属性‘,fruit);
//
Object.defineProperty(fruit,‘desc‘,{ // 抛异常
    enumerable : false
});
console.log(‘修改属性描述符为不可枚举‘,Object.keys(fruit));