Front-end app drop-down refresh how to do not empty the data, refresh only changed data?

I developed my own app, if it uses a drop-down refresh. Be sure to initialize the current page page to 1 and empty the data list. Then retrieve the data list. If the user triggers a drop-down, the effect of the page display is to go blank and instantly display the newly acquired data.
but I see Tiger Pop, Taobao is after the drop-down, but the data has changed, the rest of the unchanged data list has not been refreshed. May I ask how it is done? Is it original?


do not do this step by initializing the current page page to 1 and emptying all the data lists.

do incremental updates. For example, it turned out to be [1pr 2pr 3], and the incremental update is [4pr 5pr 1pr 2pr 3]. There is no need to empty the data.

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-64f5-7b97bd-29ea6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7b97bd-29ea6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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