[简介](%E7%AE%80%E5%87%A4%E5%8F%8C%E9%A3%9E%E4%BB%8B.md) [全局变量](%E5%85%A8%E5%B1%80%E5%8F%98%E9%87%8F.md) [判断ip涞源](%E5%88%A4%E6%96%ADip%E6%B6%9E%E6%BA%90.md) [限制浏览器访问](%E9%99%90%E5%88%B6%E6%B5%8F%E8%A7%88%E5%99%A8%E8%AE%BF%E9%97%AE.md)