爬取单条微博的评论内容 把爬取的内容保存到csv或mysql中 对评论内容进行词频分析并画出词云图 分析评论的文本情感，统计积极评论与消极评论的数量(Crawling the comment content of a single microblog Save the crawled content to CSV or mysql Analyze the word frequency of the comments and draw the word cloud Analyze the text