百度首页有一个BIDUPSID这个cookie，这是个cookie是干什么用的？还有，同一个浏览器为什么每次访问的时候这个cookie值都不变，清除cookie，本地数据库，就算卸载浏览器在安装，还是不会变，这是为什么呢？还有个问题，这个cookie可以给他删掉或者修改么？ 无
百度首页有一个BIDUPSID 这个cookie，这是个cookie是干什么用的？还有，同一个浏览器为什么每次访问的时候这个cookie值都不变，清除cookie，本地数据库，就算卸载浏览器在安装，还是不会变，这是为什么呢？还有个问题，这个cookie可以给他删掉或者修改么？
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