In jquery, you can judge whether the specified object has gained focus by judging whether "$(specified object).is(":focus")" is equal to true; the specific syntax format is "if($("selector ").is(":focus")==true){//Get focus}".
The operating environment of this tutorial: windows7 system, jquery3.3.1 version, Dell G3 computer.
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Instance of jquery judging whether the object has gained focus
Description:
is() method is used to check whether the selected element matches the selector. The :focus selector selects the focused element.
When the object has focus, $(selector).is(":focus") will return true, otherwise it will return false.
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