Jquerycookie operation code _ jquery

Jquery's cookies plug-in feels good, but when tracking and debugging, I found that the cookies still have a value with the same name, which is troublesome. Later I saw someone on the internet saying that I used this method, it seems pretty good to use JS to write cookies. It is hard to say that it is simple or simple. Simply put, it is simply a document. cookie = .., I wrote it directly. The difficulty is that some keys in cookies already exist. I want to rewrite them with JS. At this time, you use document. when the cookie is written, the key is directly re-written. Sometimes, writing fails (sometimes the characters that require the escape function will appear, the specific reason is unclear). It is very troublesome. Later, I saw the Jquery cookies plug-in, which seems to be good. However, during tracking and debugging, I found that the cookies still contain a value with the same name, this is troublesome. Later I saw someone on the internet saying that using this method is not bad.

$. Cookie ('key', '', {expires:-1, path: '/'}); you can delete the value to be reset, not bad