Question

我正在开发angularjs项目。我需要帮助创建一个函数，该函数将单个值映射到包含范围和返回的json数据数组，即如果value在该范围内，则为该范围分配相应的返回值。如何在javascript中使用查找功能实现此目的。我正在使用的json表的一个例子是：

[{"LI":"05:0","LS":null,"points":0},
 {"LI":"04:00","LS":"05:00","points":3},
 {"LI":"03:00","LS":"4:00","points":4},
 {"LI":null,"LS":"3:00","points":4}
]

基本上，如果值>> = 5.00则返回0，如果值>> 4.00且值<1。 5.00 ,,返回3.

该函数接收json表和要查找的值，然后返回与该间隔对应的点。

Answer 1

如果有人发现它有用，我的最终代码如下：

var app = angular.module('JsonMapping', []);

app.controller('MainCtrl', function($scope) {
  
  $scope.Model = {
   Value: 10,
   Result: 0,
   ReferenceTable: [{"LI":85,"LS":null,"points":15},{"LI":84,"LS":85,"points":14},{"LI":83,"LS":84,"points":13},{"LI":82,"LS":83,"points":12},{"LI":81,"LS":82,"points":11},{"LI":80,"LS":81,"points":10},{"LI":78,"LS":80,"points":8},{"LI":76,"LS":78,"points":6},{"LI":74,"LS":76,"points":4},{"LI":72,"LS":74,"points":2},{"LI":70,"LS":72,"points":1},{"LI":null,"LS":70,"points":0}]
  }
  
 $scope.GetPointsForValue = function() {
       var lowerLimit = 0, upperLimit = 0, points = 0.0;

   for (var i = $scope.Model.ReferenceTable.length - 1; i >= 0; i--) {
      lowerLimit = $scope.Model.ReferenceTable[i].LI;
      upperLimit = $scope.Model.ReferenceTable[i].LS;

      if(lowerLimit === null && parseFloat($scope.Model.Value) < upperLimit) {
          $scope.Model.Result = $scope.Model.ReferenceTable[i].points;
          break;
       }else if (upperLimit === null && parseFloat($scope.Model.Value) >= lowerLimit) {
          $scope.Model.Result = $scope.Model.ReferenceTable[i].points;
          break;
       }else if (upperLimit > parseFloat($scope.Model.Value) && parseFloat($scope.Model.Value) >= lowerLimit){
          $scope.Model.Result = $scope.Model.ReferenceTable[i].points;
          break;
       }
   }
};
  
});

<!DOCTYPE html>
<html ng-app="JsonMapping">

<head>
  <meta charset="utf-8" />
  <title>Map value to Json Array</title>
  <script>
    document.write('<base href="' + document.location + '" />');
  </script>
  <script data-require="angular.js@1.5.x" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.11/angular.min.js" data-semver="1.5.11"></script>
  <script src="app.js"></script>
</head>

<body ng-controller="MainCtrl">
  <input type="number" ng-model="Model.Value" ng-change="GetPointsForValue()">
  <p>Points for value = {{Model.Result}}
</body>

</html>

Javascript查找上限和下限之间的值

1 个答案: