m0_55977331 2022-05-23 09:44 采纳率: 76.2%
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已结题

javascript转换数据结构

如何将 result 转换为 newResult 的数据结构, 根据 groupQuestionId的相同, 来添加index, 作为序号

```javascript
let result = [
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615}, 
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15616},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15617}
    ]

    let newResult = [
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615, index: '1-1'},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615, index: '1-2'},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15615, index: '1-3'}, 
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15616, index: '2'},
      {avgScore: null,createTime: "2022-05-20 13:59:05",createUserId: 61622,groupQuestionId: 15617, index: '3'}
    ]

```

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2条回答 默认 最新

  • web修理工 2022-05-23 10:17
    关注
    

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // 如何将 result 转换为 newResult 的数据结构


        let result = [
            { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615 },
            { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615 },
            { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615 },
            { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15616 },
            { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15617 }
        ]

        let new_arr = [], newResult = [];
        result.forEach((item, index) => {
            if (Array.isArray(new_arr) && new_arr.length > 0) {
                let new_idnex = new_arr.findIndex(zitem => zitem.some(sitem => sitem.groupQuestionId == item.groupQuestionId))
                if (new_idnex != -1) {
                    new_arr[new_idnex].push(item)
                } else {
                    new_arr.push([item])
                }
            } else {
                new_arr.push([item])
            }
        })

        new_arr.forEach((item, index) => {
            if (Array.isArray(item) && item.length > 0) {
                item.forEach((zitem, zindex, itemarr) => {
                    if (itemarr.length > 1) {
                        zitem.index = (index + 1) + '-' + (zindex + 1)
                        newResult.push(zitem)
                    } else {
                        zitem.index = (index + 1) + ''
                        newResult.push(zitem)
                    }

                })
            }
        })




        console.log(JSON.stringify(newResult, null, 2))


        // let newResult = [
        //     { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615, index: '1-1' },
        //     { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615, index: '1-2' },
        //     { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15615, index: '1-3' },
        //     { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15616, index: '2' },
        //     { avgScore: null, createTime: "2022-05-20 13:59:05", createUserId: 61622, groupQuestionId: 15617, index: '3' }
        // ]
    </script>
</body>

</html>
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