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                <!DOCTYPE html>
<html lang="tr">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Site Başlığı</title>
  <ul class="liste">
    <li id="walterwhite">Walter White</li>
    <li class="alternate">Jesse Pinkman</li>
    <li>Skyler White</li>
    <li class="alternate">Hank Schrader</li>
    <li>Gustavo Fring</l>

  <input type="text" id="veri">
<button id="ekle">Listeye Öğe Ekle</button>





                var one = document.getElementById("walterwhite");

var two  = document.getElementsByClassName("alternate");

for (var i = 0; i < two.length; i++) { 
     two[i].style.color  = "red"; 

var liste = document.querySelector("ul");

var urun = document.querySelector("#veri"); 
var ekle = document.querySelector("#ekle");

  // createElement ile yeni bir listItem (li) oluşturuyoruz
  var li=document.createElement("li"); 
  // Input ile gelen veriyi "li" içerisine metin olarak giriyoruz.
  // appendChild ile oluşturduğumuz elementi "liste" isimli değişkenimizin içerisine ekliyoruz.
  // Veri inputu içerisindeki metni siliyoruz.
  veri.value = "";