Project 1 Javascript

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Project 1 Javascript</title>
</head>
<body>
    <ul>
        <li>Mangga</li>
        <li>Jeruk</li>
        <li>Pisang</li>
        <li>Alpukat</li>
        <li>Strobery</li>
        <li>Duku</li>
        <li>Sukun</li>
        <li>Singkong</li>
    </ul>
    <button onclick="ubahWarna()">Ubah Warna</button>

    <script>
        function ubahWarna(){
            var li = document.getElementsByTagName('li');

            li[1].style.color = "blue";
            li[1].style.fontWeight = "bold";

            li[3].style.color = "blue";
            li[3].style.fontWeight = "bold";

            li[5].style.color = "blue";
            li[5].style.fontWeight = "bold";

            li[7].style.color = "blue";
            li[7].style.fontWeight = "bold";
            // li.length = 8
            // for (var i = 0; i < 10; i++) {

            //     console.log('Saya belajar Javascript');

            // }
        }
    </script>
</body>
</html>