JavaScript循环通过json字符串

Question

我有以下JSON字符串:

{"index_name":"grafana1","begin":"1970-01-01T00:00:00.000Z","end":"1970-01-01T00:00:00.000Z","calculated_at":"2022-06-01T00:00:04.099Z","took_ms":0},{"index_name":"grafana2","begin":"1970-01-01T00:00:00.000Z","end":"1970-01-01T00:00:00.000Z","calculated_at":"2022-06-02T00:00:05.099Z","took_ms":0}

在我的网站(香草JavaScript制作)，我想只显示"index_name"值和"calculated_at".

我正在寻找一种方法来循环通过整个字符串的长度，并为每个条目只显示这两个键的值。

我的网站应该看起来像这样:

grafana1
2022-06-01T00:00:04.099Z
grafana2
2022-06-02T00:00:05.099Z

Answer 1

function replacer(key, value) {
console.log(typeof value);
if (key !== 'index_name') and (key !== 'calculated_at') {
return undefined;
}
return value;
}
let userStrReplacer = JSON.stringify(userObj, replacer);
console.log(userStrReplacer);