How to convert one-dimensional array to three-dimensional array in javascript? Method introduction-JS Tutorial-php.cn

How to convert one-dimensional array to three-dimensional array in javascript? Method introduction

青灯夜游

Release： 2021-12-30 10:45:49

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How to convert one-dimensional array to three-dimensional array in javascript? This article will share with you a conversion method. This method is enough to convert a JS one-dimensional array into a three-dimensional array!

How to convert one-dimensional array to three-dimensional array in javascript? Method introduction

#Today I saw a friend who asked a question. He wanted to convert a one-dimensional array into a three-dimensional array. He happened to be not very busy and was willing to help. I immediately arranged for this classmate

The following is the one-dimensional array data format returned to us by the back-end classmates

	[{
      &#39;品牌&#39;: &#39;xiaomi&#39;, &#39;机型&#39;: &#39;10&#39;, &#39;配置&#39;: &#39;512&#39;
    },
    {
      &#39;品牌&#39;: &#39;xiaomi&#39;, &#39;机型&#39;: &#39;10&#39;, &#39;配置&#39;: &#39;128&#39;
    },
    {
      &#39;品牌&#39;: &#39;xiaomi&#39;, &#39;机型&#39;: &#39;11&#39;, &#39;配置&#39;: &#39;128&#39;
    },
    {
      &#39;品牌&#39;: &#39;xiaomi&#39;, &#39;机型&#39;: &#39;11&#39;, &#39;配置&#39;: &#39;64&#39;
    },
    {
      &#39;品牌&#39;: &#39;iPhone&#39;, &#39;机型&#39;: &#39;10&#39;, &#39;配置&#39;: &#39;128&#39;
    },
    {
      &#39;品牌&#39;: &#39;iPhone&#39;, &#39;机型&#39;: &#39;11&#39;, &#39;配置&#39;: &#39;64&#39;
    },
    {
      &#39;品牌&#39;: &#39;iPhone&#39;, &#39;机型&#39;: &#39;12&#39;, &#39;配置&#39;: &#39;64&#39;
    },
    {
      &#39;品牌&#39;: &#39;honor&#39;, &#39;机型&#39;: &#39;4&#39;, &#39;配置&#39;: &#39;256&#39;
    },
    {
      &#39;品牌&#39;: &#39;honor&#39;, &#39;机型&#39;: &#39;5&#39;, &#39;配置&#39;: &#39;128&#39;
    },
    {
      &#39;品牌&#39;: &#39;honor&#39;, &#39;机型&#39;: &#39;6&#39;, &#39;配置&#39;: &#39;128&#39;
    }];

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The following is the data format we want to convert (converted into The first level of the three-dimensional array is the brand, the second level is the model, and the third level is the configuration)

    [
      {
        "value": "xiaomi",
        "label": "xiaomi",
        "children": [
          {
            "value": "10",
            "label": "10",
            "children": [
              {
                "value": "512",
                "label": "512"
              },
              {
                "value": "128",
                "label": "128"
              }
            ]
          },
          {
            "value": "11",
            "label": "11",
            "children": [
              {
                "value": "128",
                "label": "128"
              },
              {
                "value": "64",
                "label": "64"
              }
            ]
          }
        ]
      },
      {
        "value": "iPhone",
        "label": "iPhone",
        "children": [
          {
            "value": "10",
            "label": "10",
            "children": [
              {
                "value": "128",
                "label": "128"
              }
            ]
          },
          {
            "value": "11",
            "label": "11",
            "children": [
              {
                "value": "64",
                "label": "64"
              }
            ]
          },
          {
            "value": "12",
            "label": "12",
            "children": [
              {
                "value": "64",
                "label": "64"
              }
            ]
          }
        ]
      },
      {
        "value": "honor",
        "label": "honor",
        "children": [
          {
            "value": "4",
            "label": "4",
            "children": [
              {
                "value": "256",
                "label": "256"
              }
            ]
          },
          {
            "value": "5",
            "label": "5",
            "children": [
              {
                "value": "128",
                "label": "128"
              }
            ]
          },
          {
            "value": "6",
            "label": "6",
            "children": [
              {
                "value": "128",
                "label": "128"
              }
            ]
          }
        ]
      }
    ]

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First we define an arr variable to receive our one-dimensional array, and then pass arr as a parameter to us to convert the array function, the function returns our final three-dimensional array

How to convert one-dimensional array to three-dimensional array in javascript? Method introduction

The following is our arrConversion source code

    arrConversion (arr) {
      let keys = Object.keys(arr[0])
      let level1 = keys[0]//获取一级属性名称
      let level2 = keys[1]//获取二级属性名称
      let level3 = keys[2]//获取三级属性名称
      let list = Array.from(new Set(
        arr.map(item => {
          return item[level1]
        })))
      let subList = []
      list.forEach(res => {
        arr.forEach(ele => {
          if (ele[level1] === res) {
            let nameArr = subList.map(item => item.value)
            if (nameArr.indexOf(res) !== -1) {
              let nameArr2 = subList[nameArr.indexOf(res)].children.map(item => item.value)
              if (nameArr2.indexOf(ele[level2]) !== -1) {
                subList[nameArr.indexOf(res)].children[nameArr2.indexOf(ele[level2])].children.push({
                  value: ele[level3],
                  label: ele[level3],
                })
              } else {
                subList[nameArr.indexOf(res)].children.push({
                  value: ele[level2],
                  label: ele[level2],
                  children: [{
                    value: ele[level3],
                    label: ele[level3],
                  }]
                })
              }
            } else {
              subList.push({
                value: res,
                label: res,
                children: [{
                  value: ele[level2],
                  label: ele[level2],
                  children: [{
                    value: ele[level3],
                    label: ele[level3],
                  }]
                }]
              })
            }
          }
        })

      })
      return subList

    }

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The output result is correct

How to convert one-dimensional array to three-dimensional array in javascript? Method introduction

【Related recommendations: javascript learning tutorial】

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