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三种：

function specialArray(nums){    let len = nums.length;    let = count = 0;    for(let i = 0; i <= len; i++){        for(let j = 0; j < len; j++){            if(nums[j] >= i){                count++;            }        }        if(count == i){            return i;        }        count = 0;    }    return -1;}var nums = [3,6,7,7,0];

function masterMind(solution, guess){    let answer = [0, 0];    let len = 4;    for(let i = 0; i < len; i++){        if(solution.charAt(i) == guess.charAt(i)){            answer[0] += 1;            let a = solution.charAt(i);            solution = solution.replace(a, '');            guess = guess.replace(a, '');            len--;            --i;        }    }    for(let j = 0; j < len; j++){        let b = guess.charAt(j);        if(solution.indexOf(b) != -1){            answer[1] += 1;            solution = solution.replace(b, '');        }    }    return answer;}var solution="RGBY";var guess="GGRR";

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