QString截取字符串

可以使用QString类的mid(int position, int n = -1)函数来截取字符串。其中，position表示截取的起始位置，n表示截取的字符个数，默认为-1，表示截取从起始位置到字符串末尾的所有字符。例如，如果有一个QString对象str，想要从第3个字符开始截取4个字符，可以使用str.mid(2, 4)来实现。 <span class="em">1</span><span class="em">2</span><span class="em">3</span>
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