js对象怎么根据ASCII码进行排序

function sort_ascii(obj) {
    let arr = new Array();
    let num = 0;
    for (let i in obj) {
        arr[num] = i;
        num++;
    }
    let sortArr = arr.sort();
    let sortObj = {};    
    for (let i in sortArr) {
        sortObj[sortArr[i]] = obj[sortArr[i]];
    }
    return sortObj;
}

let data = {"username": "admin", "password": "123456"};
let str = sort_ascii(data);
console.log(str);//打印结果：{ "password": "123456","username": "admin"}

function sort_ascii(obj) {
    let arr = new Array();
    let num = 0;
    for (let i in obj) {
        arr[num] = i;
        num++;
    }
    let sortArr = arr.sort();
    let str = '';            
    for (let i in sortArr) {
        str += sortArr[i] + '=' + obj[sortArr[i]] + '&';
    }
    //去除两侧字符串
    let char = '&'
    str = str.replace(new RegExp('^\' + char + '+|\' + char + '+$', 'g'), '');

    return str;
}

let data = {"username": "admin", "password": "123456"};
let str = sort_ascii(data);
console.log(str);//打印结果：username=admin&password=123456