解析json时出现问题

Question

我正在尝试对 req 中的 displayName 做出反应

当我写作时

console.log(req.session.passport.user._raw)

输出是：

{
    "kind": "plus#person",
    "etag": "\"ucaTEV-ZanNH5M3SCxYRM0QRw2Y/XiR7kPThRbzcIw-YLiARoF22TMY\"",
    "emails": [
        {
            "value": "rajanlagah@gmail.com",
            "type": "account"
        }
    ],
    "objectType": "person",
    "id": "100428644453494579140",
    "displayName": "Rajan Lagah",
    "name": {
        "familyName": "Lagah",
        "givenName": "Rajan"
    },
    "url": "https://plus.google.com/100428644453494579140",
    "image": {
        "url": "https://lh3.googleusercontent.com/-XdUIqdMkCWA/AAAAAAAAAAI/AAAAAAAAAAA/4252rscbv5M/photo.jpg?sz=50",
        "isDefault": true
    },
    "isPlusUser": true,
    "language": "en",
    "circledByCount": 0,
    "verified": false
}

现在我试图从这个对象中获取kind（比如说）

console.log(req.session.passport.user._raw.kind)

那么输出是undefined

谁能说出我的错误？

Answer 1

req.session.passport.user._raw 是字符串吗？您可能需要先解析它，例如：

var data = JSON.parse(req.session.passport.user._raw);
console.log(data.kind);