JavaScript JSON 通过给定键解析而不循环

Question

给定一个 JSON 字符串:

{
    "__ENTITIES": [
        {
            "__KEY": "196",
            "__STAMP": 1,
            "ID": 196,
            "firstName": "a",
            "middleName": "b",
            "lastName": "c",
            "ContactType": {},
            "addressCollection": {
                "__deferred": {
                    "uri": "/rest/Contact(196)/addressCollection?$expand=addressCollection"
                }
            },
            "__ERROR": [
                {
                    "message": "Cannot save related entity of attribute \"ContactType\" for the entity of datastore class \"Contact\"",
                    "componentSignature": "dbmg",
                    "errCode": 1537
                }
            ]
        }
    ]
}

有没有办法只获取__ERROR记录，我知道我可以使用 var mydata = json.parse(mydata) 然后从mydata对象中查找。但我希望有一种方法可以只返回 ERROR 字段，比如 json.parse(mydata, "__ERROR") 并且仅获取 __ERROR 字段中的信息，而不将整个 JSON 字符串转换为对象

Answer 1

"Is there a method to get just the __ERROR record, I know I can use var mydata = json.parse(mydata) ... But I was hoping there was ... something like json.parse(mydata, "__ERROR")"

可能有库可以执行此操作，但没有内置任何内容。您需要编写以所需数据为目标的代码。

最接近的方法是将 reviver 函数传递给 JSON.parse。

var errors = [];

var mydata = JSON.parse(mydata, function(key, val) {
    if (key === "__ERROR")
        errors.push(val);
    return val
});