ES6 4.对象扩展

对象扩展

//es5写法
{
    let l = 1,k = 3;
    let es5 = {
        l: l,
        k: k
    }
    console.log(es5);
}

输出结果：{l: 1, k: 3}

//es6
{
    let l = 1, k = 4;
    let es6 = {
        l,
        k
    }
    console.log(es6);
}

输出结果：{l: 1, k: 4}

{
    //属性表达式
    let a = 'b';
    let es5_obj = {
        a: 'c',
        b: 'c'
    };
    let es6_obj = {
        [a]: 'c'
    }
    console.log(es5_obj,es6_obj)
}

输出结果：{a: "c", b: "c"} {b: "c"}

{
    //新增api
    console.log('字符串',Object.is('abc','abc'),'abc' === 'abc');
    console.log('数组',Object.is([],[]),[] === []);
    console.log('拷贝',Object.assign({a: 'a',b: 'b'}));
}

输出结果：字符串 true true
     数组 false false
     拷贝 {a: "a", b: "b"}