//!地圖比例
//index.php?zoom=1|最大
//index.php?zoom=2|６
//index.php?zoom=3|５
//index.php?zoom=4|４（預設）
//index.php?zoom=5|３
//index.php?zoom=6|２
//index.php?zoom=7|１
//index.php?zoom=8|最小