QJsonDocument problem on chinese key

//code
#include <QJsonValue>
#include <QJsonObject>
#include <QJsonDocument>
#include <QDebug>

int main(int argc, char *argv[])
{
    QString f_strTemp=QStringLiteral(R"({"测试1":1,"测试2":2,"地址":3,"测试4":4,"测试5":5})");
    QJsonDocument f_document=QJsonDocument::fromJson(f_strTemp.toUtf8());
    auto f_object=f_document.object();
    qDebug()<<f_object;
    auto f_keys=f_object.keys();
    for(auto f_key:f_keys)
    {
        qDebug()<<f_key<<f_object[f_key];
    }
    return 0;
}