一、将 [ { 1: 1, 2: 2, 3: 3 }, { 1: 4, 2: 5, 3: 6 },{ 1: 7, 2: 8, 3: 9 }];转换为  { 1: [1,4,7] , 2:[2,5,8 ], 3:[3,6,9] }

fn1() {

      let arr = [

        { 1: 1, 2: 2, 3: 3 }, { 1: 4, 2: 5, 3: 6 },{ 1: 7, 2: 8, 3: 9 }

      ];

      let newarr = {};

      arr.forEach((item) => {

        for (let key in item) {

          let value = newarr[key];

          if (value) {

            value.push(item[key]);

          } else {

            newarr[key] = [item[key]];

          }

        }

      });

      console.log(newarr); // {1: [1,4,7] , 2:[2,5,8 ], 3:[3,6,9] }

    }

二、['john-reese', 'harold-finch', 'sameen-shaw'] 转换成 [{name: 'John Reese'}, {name: 'Harold Finch'}, {name: 'Sameen Shaw'}]

fn2() {

      let arr = ["john-reese", "harold-finch", "sameen-shaw"];

      let objArray = arr.map((item) => {

        item = item.replace("-", " ");

        let a = item[0];

        let b = a.toUpperCase();

        item = item.replace(a, b);

        return { name: item };

      });

      console.log(objArray);

    }