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解决这样的问题:
1.如果数据库中有11条数据,每页10条,当在页面中输入3的时候会从第1条开始查询10条,也就是显示了第一页的内容。
2.如果全部数据有100页,过滤后的数据有30页,当过滤前在页面100停留,这时直接填写过滤条件并查询,页面会跳转到30页,但是数据会是过滤后第1页的数据
以上两种情况其实都是因为传递的页码大于实际的页码导致的,所以在这里做此修改。