How to set the second-level mulch not to exceed the first-level cover in Baidu map

1. How to set the secondary mulch can only be dragged in the primary mulch, and the secondary mulch can not exceed the primary mulch
2. The code is slightly
3. No error reported
4pm. If the picture is shown

5. Reference link

Mar.02,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bf4d-2badf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bf4d-2badf.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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