on click function not working stackoverflow code example

Example 1: jquery click not working

$(document).ready(function() {
  $("#clicker").click(function () {
    alert("Hello!");
    $(".hide_div").hide();
  });
});

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>

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