JS how to determine whether an element gets the focus

JS how to determine whether an element gets the focus:
May be in the actual application of the demand is not much, may also use the following way to judge too straightforward, but the principle is always so, the following is a simple judgment element is the focus of the example, the code is as follows:

$ ("#theid"). Click (function() {  var act = document.activeElement.id;   if (act== "Theid" ) {    alert ("Get Focus");  }   Else {    alert ("does not get Focus");}  );

The above code implements our requirements to determine whether the specified element receives focus.
For Activeelement, you can refer to the activeelement section of JS for a brief introduction .

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JS how to determine whether an element gets the focus