Search for all instances of a string inside a string

Hello I am using indexOf method to search if a string is present inside another string. But I want to get all the locations of where string is? Is there any method to get all the locations where the string exists?

<html>
<head>
    <script type="text/javascript">
        function clik()
        {
            var x='hit';
            //document.getElementById('hideme').value ='';
            document.getElementById('hideme').value += x;
            alert(document.getElementById('hideme').value);
        }

        function getIndex()
        {
            var z =document.getElementById('hideme').value;
            alert(z.indexOf('hit'));
        }
    </script>
</head>
<body>
    <input type='hidden' id='hideme' value=""/>
    <input type='button' id='butt1' value="click click" onClick="clik()"/>
    <input type='button' id='butt2' value="clck clck" onClick="getIndex()"/>
</body>
</html>

Is there a method to get all positions?