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int k = 2;
mm = 2.1622;
QString xx = QString::number(mm,"f",k); //保留k位小数
=====>>> xx = 2.16;//原因 k = 2;
int k = 2;
mm = 2.1622;
QString xx = QString::number(mm,"f",k); //保留k位小数
=====>>> xx = 2.16;//原因 k = 2;