QByteArray的函数insert()

//case1:Chinese string, It has an odd number of characters;
QString text_str="你好吗";//chinese
QByteArray text_arr=text_str.toUtf8();

int len=text_arr.length();
QByteArray test=text_arr.insert(len/2,"\t");

qDebug()<<"len="<<len;
qDebug()<<"test="<<test.data();

//case2:Chinese string, It has an even number of characters;
QString text_str2="你好的吗";//chinese
QByteArray text_arr2=text_str2.toUtf8();

int len2=text_arr2.length();
QByteArray test2=text_arr2.insert(len2/2,"\n");

qDebug()<<"len2="<<len2;
qDebug()<<"test2="<<test2.data();

/*

• From the above two cases, we can see that the difference between the two is that the number of Chinese characters is odd (len= odd) and the number of Chinese characters is even (Len2 = even).
  If the number of characters is odd (len= odd), we use QByteArray insert() to find the insert failed because of question marks (garbled characters).
  Only if the number of Chinese characters is even (len2= even) can we successfully insert characters using QByteArray's insert() function.
  I'm not sure if this is a bug.Maybe this function shouldn't be used this way. If so, I'm sorry for the trouble.
  *
• 通过上面两个案例我们可以看到:两者不同就是中文字符个数一个为奇数(len=奇数)，一个为偶数(len2=偶数)。
  当中文字符个数为奇数时(len=奇数)，我们用QByteArray的insert()函数插入字符可以发现插入失败，因为有问号(乱码)。
  只有当中文字符个数为偶数时(len2=偶数)，我们用QByteArray的insert()函数插入字符才能成功插入。
  我不确定这是否是一个bug。或许这个函数不应该这样使用。如果是的话,很抱歉给你们添麻烦。
  */