using push() method to create new child location without unique key stack overflow code example

Example 1: print code in js stackoverflow

<div class="modal-body">
                <div class="" id="mydata">
                    <div id="grid">Some Data</div>
                </div>
            </div>

<button type="button" id="outageSummary_printBtn" class="btnPrint" data-dismiss="modal" onclick="print()>Print</button>

Example 2: input in javascript stackoverflow

<script language="javascript" type="text/javascript">
    lol = document.getElementById('lolz').value;
    function kk(){
    alert(lol);
    }
</script>

<body>
    <input type="text" name="enter" class="enter" value="" id="lolz"/>
    <input type="button" value="click" OnClick="kk()"/>
</body>