SOURCE

let testObj = {};
//禁用可配置
Object.defineProperty(testObj,'name',{
    configurable:false,
    value:'123'
});

//testObj.name = '123';

console.log(testObj.name);
delete testObj.name;
console.log(testObj.name);
testObj.name = 333;
console.log(JSON.stringify(testObj))
var newObj = Object.assign(testObj,{});
console.log(newObj.name);

testObj = {name:333};
console.log(testObj.name);

console.log('-------------------Enumerable------------------')
let testObj2 = {};
Object.defineProperty(testObj2,'name',{
    enumerable:false,
    value:123
});
testObj2.age = 1;
console.log(testObj2);
for(let k in testObj2){
    console.log(k);
}

console.log('-----------------------------------')
let testObj3 = {};
Object.defineProperties(testObj3,{
    p1:{
        value:'p1'
    },
    p2_:{
        value:1
    },
    p2:{
        get(){
            return this.p2_;
        },
        set(v){
            this.p2_ = v;
        }
    }
})


console.log('--------------------------------------');
//无法显示方法的打印

console.log(Object.getOwnPropertyDescriptor(testObj3,'p1').writable)

console.log(Object.getOwnPropertyDescriptors(testObj3));

console.log(testObj3.hasOwnProperty('p1'));
console.log(testObj3.propertyIsEnumerable('p1'));

console.log('--------------------------------------------')

let dest, src, result; /** * 简单复制 */
dest = {}; src = { id: 'src' }; 
result = Object.assign(dest, src);
// Object.assign 修改目标对象 
// 也会返回修改后的目标对象
console.log(dest === result); 
// true console.log(dest !== src); console.log(result); console.log(dest);
// true
// { id: src } // { id: src }
/** * 多个源对象 */
dest = {};
result = Object.assign(dest, { a: 'foo' }, { b: 'bar' }); 
console.log(result); // { a: foo, b: bar }
/** * 获取函数与设置函数 */
dest = { 
    set a(val) { 
        console.log(`Invoked dest setter with param ${val}`); 
    } 
}; 
    src = { 
        get a() {
            console.log('Invoked src getter'); return 'foo';
        } 
    };
Object.assign(dest, src); 
// 调用 src 的获取方法 
// 调用 dest 的设置方法并传入参数"foo" 
// 因为这里的设置函数不执行赋值操作 
// 所以实际上并没有把值转移过来
console.log(dest); // { set a(val) {...} }

console.log('-----------Object.is()---------')
function recursivelyCheckEqual(x, ...rest) { 
    return (Object.is(x, rest[0]) && (rest.length < 2 || recursivelyCheckEqual(...rest)))
}
console.log(recursivelyCheckEqual(NaN,NaN,NaN));
console.log(Object.is(NaN,NaN));
console.log(Object.is({},{}));
console.log(+0 === -0);
console.log(Object.is(+0,-0));

console.log('---------------------------解构------------------')

let person = {
    name:'test',
    
    age:'123',
    sex:{
        man:1
    }
};

// let {name,age} = person;
// console.log(name,age);
let {name:personName,age:personAge} = person;
console.log(personName,personAge);
let {sex:{man:sss}} = person;
console.log(sss)

let {name,test,age,sex} = person; 
console.log(name,test,age,sex);
let {_} = null;