Untitled

<html>
    <head>
        <title>
            Element Tebal dan Tidak
        </title>
    </head>
    <body>
        <ul>
            <li>Jeruk</li>
            <li>Mangga</li>
            <li>Pisang</li>
            <li>Jambu</li>
            <li>Pepaya</li>
            <li>Alpukat</li>
            <li>Pir</li>
            <li>Anggur</li>
        </ul>
        <button onclick="changeElement()">Ubah Warna Element Genap</button>
        <script>
            function changeElement(){
                var list = document.getElementsByTagName('li');
                // list[1].style.color = "blue";
                // list[1].style.fontWeight = "bold";
                // list[3].style.color = "blue";
                // list[3].style.fontWeight = "bold";
                // list[5].style.color = "blue";
                // list[5].style.fontWeight = "bold";
                // list[7].style.color = "blue";
                // list[7].style.fontWeight = "bold";
                for(var i = 0; i < list.length; i++){

                    if(i % 2 == 0){
                        continue;
                    } else {
                        list[i].style.color = "blue";
                        list[i].style.fontWeight = "bold";
                    }
                }
            }
        </script>
    </body>
</html>