QJsonObject和QString互转

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1、QJsonObject转QString

QString str = QString(QJsonDocument doc(jsonObject).toJson(QJsonDocument::Indented));

2、QString转QJsonObject

QString str = "...";
QJsonObject obj = QJsonDocument::fromJson(str.toUtf8()).object();

3、QJsonArray转QString

QString str = QJsonDocument(arr).toJson(QJsonDocument::Compact).constData();

4、QString转QJsonArray

QJsonArray arry = QJsonDocument::fromJson(str.toUtf8()).array();