JavaScript:数组迭代缺失值时缺少逻辑

Question

当特定月份没有可用数据时，我试图填充空白值。这是 plunker.. http://plnkr.co/edit/f0IklkUfX8tkRZrn2enx?p=preview

$scope.year = [
{"month":"mar", "val":"23"},
{"month":"feb", "val":"45"},
{"month":"jan", "val":"56"}   
];

var total = ["jan", "feb", "mar", "apr", "may", "jun", "aug", "sep", "oct", "nov", "dec"];


for(var i=0; i<total.length; i++){

if($scope.year[i].month === undefined){ //logic here to see absent month.

        $scope.year.push(
        {
            "month":total[i],
            "val":"0" 
        })
    }
}

我已经创建了默认总月项目数组，用于比较预期对象中的每个月项目，如果预期对象中不存在该项目，则需要在预期对象本身中创建空项目或值为“0”。

Answer 1

你可以做如下的事情

Js 更新

var year = [
{"month":"mar", "val":"23"},
{"month":"feb", "val":"45"},
{"month":"jan", "val":"56"}   
];

var total = ["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"];


// Current months array
var currentMonth = [];
angular.forEach(year, function(item){
currentMonth.push(item.month); 
});

// iterating over months
for(var i=0; i<total.length; i++){
  //$scope.year = [];

// checking if month is absent
if(currentMonth.indexOf(total[i]) === -1){ //logic here to see absent month.

        year.push(
        {
            "month":total[i],
            "val":"0",
            "order" : i
        })
    } else {
     year[currentMonth.indexOf(total[i])].order = i;    // adding order
}
} 

$scope.year = year;

标记

 <!-- Order by new property order -->
 <td ng-repeat="item in year | orderBy: 'order'">
            {{item.val}}
          </td>

供引用 - http://plnkr.co/edit/km6jLQv8wxm1XP8QCxvV?p=preview