如何訪問存儲在Json對象中的數組？

Question

我有這樣的json響應，我想從中獲取所有項目名稱。

我像平常一樣遍歷數組，但這里的“ d”不是數組。 如何取得結果：

{
    "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;
});

這將導致如下數組：

["Payroll", "Permanant"]

（假設myData是您問題中的對象）

Answer 2

您可以使用jsonObject.d.results從響應中獲取數組，並使用forEach()迭代數組

 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>') }) 

如果要以數組形式獲取它，則可以使用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));