let objArr = [{
                questionAnswer: "喜歡",
                AnswerKey: "C"
            },
            {
                questionAnswer: "不喜歡",
                AnswerKey: "A"
            },
            {
                questionAnswer: "非常喜歡",
                AnswerKey: "D"
            },
            {
                questionAnswer: 
 
"一般",
                AnswerKey: "B"
            }
        ]

        function sortByKey(arr, reverse) {
            //不傳reverse或者reverse為true為正序否則為倒序
            if (reverse == undefined) reverse = 1
            else reverse = reverse ? 1 : -1;
            return function(a, b) {
                //return的函式  a,b為sort方法的兩個引數
 

                a = a[arr];
                b = b[arr];
                if (a < b) {
                    return reverse * -1;
                }
                if (a > b) {
                    return reverse * 1;
                }
                return 0;
            };
        }
        let result 
 
= objArr.sort(sortByKey("AnswerKey"))
        console.log(result)

不只是A,B,C 數字同理可用