最长子字符串

function main(string) {
    let obj = {};
    let stringArr = string.split('');
    for (let i = 0; i< stringArr.length; i++) {
        let result = [];
        for (let j = i; j < stringArr.length; j++) {
            if (!result.includes(stringArr[j])) {
                result.push(stringArr[j])
                console.log('result is', result);
                if (j === stringArr.length - 1) {
                    obj[i] = result.length;
                    break;
                }
            } else {
                obj[i] = result.length;
                console.log('obj is', obj);
                break;
            }
        }
    }
    console.log(obj);
    console.log(Math.max(...Object.values(obj)));
    // return Math.max(Object.values(obj));
}

let res = main('abcbd');
console.log(res);
console.log('abcbd'.split(''));