如何像对象一样操纵Json响应？

Question

我的jQuery.ajax返回JSon对象.我首先阅读其他文章.但他们的回应文字不喜欢我的. 我的回复内容:来自萤火虫响应

{"item":"[{\"country\":\"USA\",\"lan\":\"EN\"},{\"country\":\"Turkiye\",\"lan\":\"TR\"}]"}

现在我试图提醒countryName:

$('#loadData').click(function() {
            $.ajax({
                type: "POST",
                url: "WS/myWS.asmx/getDaa",
                data: "{}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function(msg) {
                $("#jsonResponse").html(msg);
                    $.each(msg.item, function(i, d) {
                        alert(this.country);
                        debugger;
                    });
                },
            });
        });

但它警告"未定义"

Answer 1

item的值是一个字符串.因此,您首先需要将其解析为json.试试这个.

$("#jsonResponse").html(msg);
    var item = jQuery.parseJSON(msg.item)
    $.each(item, function(i, d) {
        alert(this.country);
        debugger;
    });
},

Answer 2

{"item":"[{\"country\":\"USA\",\"lan\":\"EN\"},{\"country\":\"Turkiye\",\"lan\":\"TR\"}]"}
        ^
        |
        +---- It's a string, not an array !

你的JSON应该是这样的

{"item":[ {"country":"USA","lan":"EN"},{"country":"Turkiye","lan":"TR"}]}

然后你就可以像访问它一样

country = msg.item[0];
lang    = country.lan;

for (i=0; i< item.length; i++) { alert ( item[i].country); }

等等...