用于搜索出一段数据包内介于“元素头”与“元素尾”之间的所有数据，解决了搜索出的数据段大于1时出现自动生成“0元素”的bug，适合新手学习-Of all data used to search for some data packets between " elements head"　and " element tail"　to solve the automatically generated search the data segment is greater than 1 " 0 elements"　bug, suitable for novice learning