在javascript中显示数组中的前一个元素答案

【问题标题】：Display previous element in an array in javascript在javascript中显示数组中的前一个元素
【发布时间】：2021-12-01 22:23:22
【问题描述】：

我有一组对象。我在过滤所有“@KAV”：“1”对象后尝试下面的一个。

let finalArray=kavArray[index-1];

kavArray 中存在的所有 "@KAV":"1" 对象。

在满足 "@KAV":"1" 存在的条件之前如何显示这些项目？

谢谢。

         [
          {
            "@USEFORMAT": "1",
            "@TEUR": "מרכיבי שכר לתשלום",
            "@SUG_TASHLUM": "6",
            "@TAARIF": "104135.00",
            "@SCHUM_HODSHI": "107250.13",
            "@KAV": "2"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "שכר יסוד",
            "@SUG_TASHLUM": "6",
            "@KAVUA": "9",
            "@SCHUM_HODSHI": "50.00",
            "@SEMEL": "1",
            "@KAV": "0"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "ש.רגילות",
            "@SUG_TASHLUM": "6",
            "@SCHUM_HODSHI": "13652.67",
            "@SEMEL": "101",
            "@KAV": "0"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "שכר בסיס",
            "@SCHUM_HODSHI": "13702.67",
            "@KAV": "1"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "תשלום קיטנה",
            "@SUG_TASHLUM": "6",
            "@TAARIF": "182.55",
            "@KAMUT": "1.00",
            "@KAVUA": "מק",
            "@SCHUM_HODSHI": "182.55",
            "@SEMEL": "90",
            "@KAV": "0"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "החזר הוצאות",
            "@SCHUM_HODSHI": "182.55",
            "@KAV": "1"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "תוספת פינוק",
            "@SUG_TASHLUM": "6",
            "@KAVUA": "או",
            "@SCHUM_HODSHI": "3200.00",
            "@SEMEL": "73",
            "@KAV": "0"
          },
          {
            "@USEFORMAT": "1",
            "@TEUR": "מענקים",
            "@SCHUM_HODSHI": "3200.00",
            "@KAV": "1"
          },
          
          
        ]

我怎样才能实现这些元素？

【问题讨论】：

标签： javascript arrays reactjs react-native

【解决方案1】：

您可以使用Array.filter() 过滤下一项具有键/值@KAV:"1" 的元素

const kavArray = [ { "@USEFORMAT": "1", "@TEUR": "מרכיבי שכר לתשלום", "@SUG_TASHLUM": "6", "@TAARIF": "104135.00", "@SCHUM_HODSHI": "107250.13", "@KAV": "2" }, { "@USEFORMAT": "1", "@TEUR": "שכר יסוד", "@SUG_TASHLUM": "6", "@KAVUA": "9", "@SCHUM_HODSHI": "50.00", "@SEMEL": "1", "@KAV": "0" }, { "@USEFORMAT": "1", "@TEUR": "ש.רגילות", "@SUG_TASHLUM": "6", "@SCHUM_HODSHI": "13652.67", "@SEMEL": "101", "@KAV": "0" }, { "@USEFORMAT": "1", "@TEUR": "שכר בסיס", "@SCHUM_HODSHI": "13702.67", "@KAV": "1" }, { "@USEFORMAT": "1", "@TEUR": "תשלום קיטנה", "@SUG_TASHLUM": "6", "@TAARIF": "182.55", "@KAMUT": "1.00", "@KAVUA": "מק", "@SCHUM_HODSHI": "182.55", "@SEMEL": "90", "@KAV": "0" }, { "@USEFORMAT": "1", "@TEUR": "החזר הוצאות", "@SCHUM_HODSHI": "182.55", "@KAV": "1" }, { "@USEFORMAT": "1", "@TEUR": "תוספת פינוק", "@SUG_TASHLUM": "6", "@KAVUA": "או", "@SCHUM_HODSHI": "3200.00", "@SEMEL": "73", "@KAV": "0" }, { "@USEFORMAT": "1", "@TEUR": "מענקים", "@SCHUM_HODSHI": "3200.00", "@KAV": "1" }, ]


const filteredArray = kavArray.filter((item, index) => kavArray[index+1] && kavArray[index+1]["@KAV"] === "1")

console.log(filteredArray)

【讨论】：

我想在对象之前显示每个 "@KAV":"1"。@Harun Yilmaz
@Chinmayee 我不确定我是否理解所需的输出。你也可以提供吗？

【解决方案2】：

您可以使用 JavaScript 的 filter 方法来完成。

const arr = [
  {
    "@USEFORMAT": "1",
    "@TEUR": "מרכיבי שכר לתשלום",
    "@SUG_TASHLUM": "6",
    "@TAARIF": "104135.00",
    "@SCHUM_HODSHI": "107250.13",
    "@KAV": "2"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "שכר יסוד",
    "@SUG_TASHLUM": "6",
    "@KAVUA": "9",
    "@SCHUM_HODSHI": "50.00",
    "@SEMEL": "1",
    "@KAV": "0"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "ש.רגילות",
    "@SUG_TASHLUM": "6",
    "@SCHUM_HODSHI": "13652.67",
    "@SEMEL": "101",
    "@KAV": "0"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "שכר בסיס",
    "@SCHUM_HODSHI": "13702.67",
    "@KAV": "1"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "תשלום קיטנה",
    "@SUG_TASHLUM": "6",
    "@TAARIF": "182.55",
    "@KAMUT": "1.00",
    "@KAVUA": "מק",
    "@SCHUM_HODSHI": "182.55",
    "@SEMEL": "90",
    "@KAV": "0"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "החזר הוצאות",
    "@SCHUM_HODSHI": "182.55",
    "@KAV": "1"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "תוספת פינוק",
    "@SUG_TASHLUM": "6",
    "@KAVUA": "או",
    "@SCHUM_HODSHI": "3200.00",
    "@SEMEL": "73",
    "@KAV": "0"
  },
  {
    "@USEFORMAT": "1",
    "@TEUR": "מענקים",
    "@SCHUM_HODSHI": "3200.00",
    "@KAV": "1"
  },


];

const result = arr.filter(item => item["@KAV"] === "1");
console.log(result);

filter 的文档

【讨论】：