javascript - Jquery 将值添加到数组(如果不存在)

Question

我有以下函数，如果数组不存在，它应该将值添加到数组中。

    var category_json = new Array();
                $.ajax({
                    type: 'POST',
                    url: "<?php echo base_url(); ?>Reports/appointment_distribution_by_group/",
                    dataType: 'JSON',
                    data: {county: county, sub_county: sub_county, facility: facility, date_from: date_from, date_to: date_to},
                    success: function (data) {
                        // Populate series
                        for (i = 0; i < data.length; i++) {
 /* Values returned from variable data as data[i].group_name = > Adolescents,Adolescents,All,All,ART Clients,ART Clients,ART Clients,ART Clients,Lactating woman,New Clients,New Clients,Paeds on ART,Paeds on ART,PMTCT,PMTCT */                               
                            if(jQuery.inArray(data[i].group_name,category_json)!== -1) {
                                //element exists in array
                                console.log(" Found ..." + data[i].group_name);
                            } else {
                                //element not found in array
                                category_json.push([data[i].group_name]);
                                console.log("Not Found ..."+data[i].group_name);
                                console.log(category_json);
                            }

                        }
                        var type = jQuery.type(category_json);
                        alert(category_json);
                        alert(type);
                        // draw chart

                    }, error: function (errorThrown) {

                    }});

我想将返回值添加到类别 json 数组中，但仅限唯一值。但是，检查数组中的值根本不会返回 true。我应该使用哪个条件来检查数组中是否存在该值？

Answer 1

将元素推送到另一个数组中的数组

你的代码category_json.push([data[i].group_name]);

应该像这样 category_json.push(data[i].group_name);

示例:

var arr = [1, 2];

arr.push([3]);

console.log(arr); // [1, 2, [3]]

之后你像这样检查arr.indexOf(3)并且总是返回-1