SOURCE

//字符串的去重排序
const s1 = 'bacha';
const s2 = 'bbaaccedfg'
function uniqueStr(arr){
    const s1Arr = arr.split('');
    const uniqueArr = [...new Set(s1Arr)];   
    return uniqueArr.sort().toString().replace(/,/g,'');
}
console.log(uniqueStr(s1));
console.log(uniqueStr(s2));