Question

我想按属性值过滤JavaScript对象。这是一个场景：

以下数组是我正在使用

的一个小例子

 var array = [{

    "Title": "July 13 - July 19 2014",
    "displayAd_imp": "15,242,505",
    "Date": "2014-07-17T00:00:00.000Z",
    "WeekNo": 29
}, {

    "Title": "July 20 - July 26 2014",
    "displayAd_imp": "15,942,705",
    "Date": "2014-07-24T00:00:00.000Z",
    "WeekNo": 30
}, {

    "Title": "July 27 - Aug 2 2014",
    "displayAd_imp": "15,683,545",
    "Date": "2014-07-31T00:00:00.000Z",
    "WeekNo": 31
}, {

    "Title": "Aug 3 - Aug 9 2014",
    "displayAd_imp": "15,042,005",
    "Date": "2014-08-07T00:00:00.000Z",
    "WeekNo": 32
}, {

    "Title": "Aug 10 - Aug 17 2014",
    "displayAd_imp": "15,442,605",
    "Date": "2014-08-14T00:00:00.000Z",
    "WeekNo": 33
}]

在我的应用中，有两个下拉字段可供用户选择一系列周。我正在通过“日期”计算周数并插入“WeekNo”作为属性。我想使用WeekNo来获取基于起始端值的一大块数据。

示例是如果开始日期是第29周并且结束是第32周，则该方法将返回相关数据。

如果有人想要更新它，我会Jsfiddle。

提前感谢！

Answer 1

您可以使用Array.filter功能。您可以直接在阵列上调用它，然后提供回调。如果该回调返回true，则该元素将包含在从filter返回的新数组中。

例如：

var newArr = array.filter(function(item) {
    return (item.WeekNo >= 29 && item.WeekNo < 32);
});

Here's an updated JSfiddle包含此内容。

Answer 2

 var array = [{
     "Title": "July 13 - July 19 2014",
     "displayAd_imp": "15,242,505",
     "Date": "2014-07-17T00:00:00.000Z",
     "WeekNo": 29
 }, {
     "Title": "July 20 - July 26 2014",
     "displayAd_imp": "15,942,705",
     "Date": "2014-07-24T00:00:00.000Z",
     "WeekNo": 30
 }, {
     "Title": "July 27 - Aug 2 2014",
     "displayAd_imp": "15,683,545",
     "Date": "2014-07-31T00:00:00.000Z",
     "WeekNo": 31
 }, {
     "Title": "Aug 3 - Aug 9 2014",
     "displayAd_imp": "15,042,005",
     "Date": "2014-08-07T00:00:00.000Z",
     "WeekNo": 32
 }, {

     "Title": "Aug 10 - Aug 17 2014",
     "displayAd_imp": "15,442,605",
     "Date": "2014-08-14T00:00:00.000Z",
     "WeekNo": 33
 }]

 var predicate = function(start, end) {
     return function(array) {
         return _.inRange(array.WeekNo, start, end + 1);
     }
 }

 var result = _.filter(array, predicate(29, 32));

 console.log('inRange', result);

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在javascript中过滤对象数组

2 个答案: