JS中多层次排序算法的实现代码

网络编程 2024/11/15 佚名

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引子

排序在编程中随处可见，从开始学习变成，到项目开发，基本上或多或少会遇到一些排序问题，接下来我要写的是我在实际开发终于到的一个排序问题，一开始卡了我很久，后面随着知识积累，实践变多才解决掉了，不知道是不是我搜索关键字不对，还是其他原因，百度也没有找到这方面的内容。

数据结构和需求

var arr = [ {
"soNumber" : "52085848",
"item" : "313281",
"amount" : "3"
}, {
"soNumber" : "52085846",
"item" : "313321",
"amount" : "10"
}, {
"soNumber" : "52085848",
"item" : "313330",
"amount" : "5"
}, {
"soNumber" : "52085846",
"item" : "313321",
"amount" : "4"
}, {
"soNumber" : "52085843",
"item" : "313338",
"amount" : "13"
}, {
"soNumber" : "52085843",
"item" : "422784",
"amount" : "108"
} ]

数据结构如上，数组结构，每个数组元素由对象构成，soNumber代表采购订单编号，item代表物料，现需求是soNumber（采购订单编号）从小到大排序，且基于相同的采购订单下的物料数据编号需要从小到大排列。

两层排序实现代码

解决思路：

先将soNumber按从小到大的顺序整理成数组，然后以销售订单数组为外层循环，实际数据为内层循环，引入一个中间数组，中间数组中的item从小到大排序，最后按顺序将所有的中间数组元素放入新数组中。

实现代码：

/**
   * 两层排序算法
   */
  function multilayerSorting() {
   var arr = [ {
    "soNumber" : "52085848",
    "item" : "313281",
    "amount" : "3"
   }, {
    "soNumber" : "52085846",
    "item" : "313321",
    "amount" : "10"
   }, {
    "soNumber" : "52085848",
    "item" : "313330",
    "amount" : "5"
   }, {
    "soNumber" : "52085846",
    "item" : "313321",
    "amount" : "4"
   }, {
    "soNumber" : "52085843",
    "item" : "313338",
    "amount" : "13"
   }, {
    "soNumber" : "52085843",
    "item" : "422784",
    "amount" : "108"
   } ]
   // 整理soNumber成数组,并且从小到大排列
   var soData = getSoData(arr);
   var newData = [];
   for ( var i in soData) {
    var midData = []
    for ( var j in arr) {
     if (soData[i] == arr[j].soNumber) {
      midData.push(arr[j]);
     }
    }
    midData = midData.sort(function(obj1, obj2) {
     var val1 = Number(obj1.item);
     var val2 = Number(obj2.item);
     if (val1 < val2) {
      return -1;
     } else if (val1 > val2) {
      return 1;
     } else {
      return 0;
     }
    });
    log.debug('midData', midData);
    for ( var m in midData) {
     newData.push(midData[m]);
    }
   }
   log.debug('newData', newData);
   return newData;
  }
  function getSoData(arr) {
   var soData = [];
   for ( var i in arr) {
    if (soData.indexOf(arr[i].soNumber) == -1) {
     soData.push(arr[i].soNumber);
    }
   }
   soData.sort();
   log.debug('soData', soData);
   return soData;
  }<br>

最终数组截图:

对比一开始的数组和排序后的数组确实实现了按照soNumber和item两个部分顺序排列,但是也可以看到圈出来的部分的amount金额在相同的soNumber和item下并没有顺序,如果要实现amount部也有序呢"htmlcode">

/**
    * 三层排序算法
    */
   function multilayerSorting() {
    var arr = [ {
     "soNumber" : "52085848",
     "item" : "313281",
     "amount" : "3"
    }, {
     "soNumber" : "52085846",
     "item" : "313321",
     "amount" : "10"
    }, {
     "soNumber" : "52085848",
     "item" : "313330",
     "amount" : "5"
    }, {
     "soNumber" : "52085846",
     "item" : "313321",
     "amount" : "4"
    }, {
     "soNumber" : "52085843",
     "item" : "313338",
     "amount" : "13"
    }, {
     "soNumber" : "52085843",
     "item" : "422784",
     "amount" : "108"
    } ]
    // 整理soNumber成数组,并且从小到大排列
    var soData = getSoData(arr);
    var newData = [];
    for ( var i in soData) {
     var midData = []
     for ( var j in arr) {
      if (soData[i] == arr[j].soNumber) {
       midData.push(arr[j]);
      }
     }
     midData = midData.sort(function(obj1, obj2) {
      var val1 = Number(obj1.item);
      var val2 = Number(obj2.item);
      if (val1 < val2) {
       return -1;
      } else if (val1 > val2) {
       return 1;
      } else {
       return 0;
      }
     });
     var itemData = []
     for ( var m in midData) {
      if (itemData.indexOf(midData[m].item) == -1) {
       itemData.push(midData[m].item)
      }
     }
     for ( var n in itemData) {
      var midData1 = [];
      for ( var x in midData) {
       if (midData[x].item == itemData[n]) {
        midData1.push(midData[x]);
       }
      }
      midData1 = midData1.sort(function(obj1, obj2) {
       var val1 = Number(obj1.amount);
       var val2 = Number(obj2.amount);
       if (val1 < val2) {
        return -1;
       } else if (val1 > val2) {
        return 1;
       } else {
        return 0;
       }
      });
      for ( var y in midData1) {
       newData.push(midData1[y]);
      }
     }
    }
    log.debug('newData', newData);
    return newData;
   }
   function getSoData(arr) {
    var soData = [];
    for ( var i in arr) {
     if (soData.indexOf(arr[i].soNumber) == -1) {
      soData.push(arr[i].soNumber);
     }
    }
    soData.sort();
    log.debug('soData', soData);
    return soData;
   }

实现结果

从结果可以看出实现了依次按照soNumber ,item ,amount 从小到大排列

思考

从两层排序到三层排序我们可以发现代码原来越繁琐,如果要实现四层就更加麻烦了,不知道是否有更好的办法实现这种多维度,多层次的排序。

var arr = [ {
"soNumber" : "52085848",
"item" : "313281",
"amount" : "3"
}, {
"soNumber" : "52085846",
"item" : "313321",
"amount" : "10"
}, {
"soNumber" : "52085848",
"item" : "313330",
"amount" : "5"
}, {
"soNumber" : "52085846",
"item" : "313321",
"amount" : "4"
}, {
"soNumber" : "52085843",
"item" : "313338",
"amount" : "13"
}, {
"soNumber" : "52085843",
"item" : "422784",
"amount" : "108"
} ]