网络爬虫需求分析目录1.引言....................................................................................................................................................................31.1 编写目的.................................................................................................................................................31.2 背景.........................................................................................................................................................31.3 定义.........................................................................................................................................................31.4 参考资料.................................................................................................................................................32.任务概述............................................................................................................................................................42.1 目标.........................................................................................................................................................42.2 用户的特点.............................................................................................................................................52.3 假定和约束.............................................................................................................................................52.4 假设与依据.............................................................................................................................................53.需求规定............................................................................................................................................................53.1 对功能的规定.........................................................................................................................................53.1.1 使用库.............................
