when doing the daily input box and comment box, the contenteditable attribute is used, and then the input box is focused by adding $("- sharpdiv"). Focus () method) to the input box when the user clicks on the page. But interestingly, the focus amount effect can be perfectly achieved on both PC and android mobile phones, and the focus effect can be achieved on ios 10.x version or even 11.0 version. 
11.2
is there something new in the version? Which god guided the trouble to answer, thank you very much!
and why ios cannot paste content in elements that use the conteditable attribute, both on PC and on android phones.