目录普通查询按照所需字段排序查询数据库表的全部内容精确查询只返回所需要的字段信息比较查询关联查询多条件模糊查询聚合常用管道常用表达式$group$match$project$sort$limit$skip先写skip，再写limit总结普通查询
How do I get this form input to be stored in a variable, that I can then use later - rather than being appended to the end of the URL?
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