这里给大家介绍QString中的两个函数
1.QString QString::simplified() const
Returns a string that has whitespace removed from the start and the end, and that has each sequence of internal whitespace replaced with a single space.
返回一个字符串,移除从一开始到结尾的空白,每个序列内部的空格替换为一个空格（头尾的都去掉了）
举个例子：[cpp]
QString str = " lots\t of\nwhitespace\r\n ";
str = str.simplified();
// str == "lots of whitespace";
QString str = " lots\t of\nwhitespace\r\n ";
str = str.simplified();
// str == "lots of whitespace";'\t', '\n', '\v', '\f', '\r', ' ' 都属于空白的处理范围。
2.QString QString::trimmed() const
Returns a string that has whitespace removed from the start and the end.
返回一个字符串,移除从一开始到结尾的空白。也去掉头尾的空白
举个例子：
[cpp]
QString str = " lots\t of\nwhitespace\r\n ";
str = str.trimmed();
// str == "lots\t of\nwhitespace"
QString str = " lots\t of\nwhitespace\r\n ";
str = str.trimmed();
// str == "lots\t of\nwhitespace"