javascript - 如何从 xhr.responseText 获取 "Data"字段？

Question

我有下面给出的 XMLHttpRequest() 函数

var searchFriendRequests = function (userid) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', 'http://localhost:6344/api/Registeration/searchFriendrequests?userid=' + userid, false);
    xhr.setRequestHeader("Content-Type", "text/xml");
    xhr.onreadystatechange = function () {
        if (xhr.readyState == 4) {
            if (xhr.status == 200) {
                var data = xhr.responseText;
            }
        }
    };
    xhr.send(null);
}

其中 xhr.responseText 返回值为

{
    "$id": "1",
    "ContentEncoding": null,
    "ContentType": null,
    "Data": [
        {
            "$id": "2",
            "email": "anu@gmail.com"
        },
        {
            "$id": "3",
            "email": "anu@gmail.com"
        }
    ],
    "JsonRequestBehavior": 1,
    "MaxJsonLength": null,
    "RecursionLimit": null
}

如何从 responseText 中获取 Data 字段？

Answer 1

使用JSON.parse() ，比如:

var data=xhr.responseText;
var jsonResponse = JSON.parse(data);
console.log(jsonResponse["Data"]);