如何访问存储在Json对象中的数组？

Question

我有这样的json响应，我想从中获取所有项目名称。

我像平常一样遍历数组，但这里的“ d”不是数组。 如何取得结果：

{
    "d": {
    "results": [
        {
            "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500",
            "ProjectName": "Payroll",
            "EnterpriseProjectTypeDescription": null,
            "EnterpriseProjectTypeId": null,
            "EnterpriseProjectTypeIsDefault": null
        },
        {
            "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505",
            "ProjectName": "Permanant",
            "EnterpriseProjectTypeDescription": null,
            "EnterpriseProjectTypeId": null,
            "EnterpriseProjectTypeIsDefault": null
        }
    ]
    }
}

Answer 1

使用Array.prototype.map() ：

var names = myData.d.results.map(function(item){
    return item.ProjectName;
});

这将导致如下数组：

["Payroll", "Permanant"]

（假设myData是您问题中的对象）

Answer 2

您可以使用jsonObject.d.results从响应中获取数组，并使用forEach()迭代数组

 var res = { "d": { "results": [{ "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500", "ProjectName": "Payroll", "EnterpriseProjectTypeDescription": null, "EnterpriseProjectTypeId": null, "EnterpriseProjectTypeIsDefault": null }, { "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505", "ProjectName": "Permanant", "EnterpriseProjectTypeDescription": null, "EnterpriseProjectTypeId": null, "EnterpriseProjectTypeIsDefault": null } ] } }; res.d.results.forEach(function(v) { document.write(v.ProjectName + '<br>') }) 

如果要以数组形式获取它，则可以使用map()

 var res = { "d": { "results": [{ "ProjectId": "696fcc7c-f355-e511-93f0-00155d008500", "ProjectName": "Payroll", "EnterpriseProjectTypeDescription": null, "EnterpriseProjectTypeId": null, "EnterpriseProjectTypeIsDefault": null }, { "ProjectId": "696fcc7c-f355-e511-93f0-00155d008505", "ProjectName": "Permanant", "EnterpriseProjectTypeDescription": null, "EnterpriseProjectTypeId": null, "EnterpriseProjectTypeIsDefault": null }] } }; var result = res.d.results.map(function(v) { return v.ProjectName; }) document.write(JSON.stringify(result));