How to validation people picker column in newform/ediform.aspx

Javascript:

<script type="text/javascript">

 function fnassign(){
        try{
       

var len3=$("div [title='Assign To']").find(".sp-peoplepicker-resolveList").find("span").length;
        if(len3!=3){

 alert("Please enter the AssignTo value");

        return false;

        }

}

        }

        catch(e)

        {

        alert(e);

        }

        }

</script>