How to determine whether an object has focus in jquery

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

<input type="text" id="input">

<script>
   // 延迟2s判断输入框是否具有焦点
   setTimeout(()=>{
       if($("#input").is(":focus")==true){  
           console.log(&#39;focus&#39;)
       }else{  
           console.log(&#39;blur&#39;)
       }
   }, 2000)
</script>

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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