二进制加法-Js

        function add(a, b) {
            let i = a.length;
            let j = b.length;
            let up = 0;
            let res = [];
            // console.log(i,j);
            while (i > 0 || j > 0) {
                let cur1 = a.charAt(i - 1) - 0
                let cur2 = b.charAt(j - 1) - 0
                let temp = cur1 + cur2 + up
                if (temp > 1) {
                    up = 1
                    temp -= 2
                } else {
                    up = 0
                }
                i--
                j--
                res.unshift(temp)
            }
            if (up !== 0) {
                res.unshift(up)
            }
            return res.join('')
        }
        console.log(add('1010', '11'), '====');

　　结果 ：