说明：  对前程无忧爬取数据进行初步处理后,分析城市、工作经验和学历要求与职位数的关系,城市、学历和工作经验与平均月薪的关系,最后制作岗位词云
(After preliminary processing of 51job s data, analyze the relationship between the city, work experience, education requirements and the number of positions, and the relationship between the city, education and work experience and the average monthly salary, and finally make the post word cloud)