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?

Javascript drop-down-refresh app-development html5

Jun.07,2022

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.

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