QString str;
QString tip = QString::fromLocal8Bit("中国人口总数：");
QString tip2 = QString::fromUtf8(tip.toUtf8().data());
str.sprintf("%s %d",tip2.toUtf8().data(), 14);
textEdit->setPlainText (str);
或:
QString str;
QString tip = QString::fromLocal8Bit("中国人口总数：");
str.sprintf("%s %d", tip.toUtf8().data(), 14);
textEdit->setPlainText (str);
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