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例如:
<codes>\n\r\t</codes>
当我读取字符串中的节点“代码”时,它应该包含 3 个字符'\n', '\r','\t'就好像它是s="\n\r\t";
'\n'
'\r'
'\t'
s="\n\r\t";
您可以使用十六进制字符实体:
<codes>

	</codes>