js 数组两两组合

function twoByTwoCombination(arr) {
    let result = [];
    for (let i = 0; i < arr.length - 1; i++) {
        for (let j = i + 1; j < arr.length; j++) {
            result.push([arr[i], arr[j]]);
        }
    }
    return result;
}

let array = [1, 2, 3, 4];
console.log(twoByTwoCombination(array));
// 输出: [ [ 1, 2 ], [ 1, 3 ], [ 1, 4 ], [ 2, 3 ], [ 2, 4 ], [ 3, 4 ] ]