如何让脚本只从整个表单中提取一个值

<form id="myForm">
  <label for="name">姓名：</label>
  <input type="text" id="name" name="name" value="John">
  <br>
  <label for="email">邮箱：</label>
  <input type="email" id="email" name="email" value="john@example.com">
</form>

<button onclick="extractValue()">提取值</button>

function extractValue() {
  var form = document.getElementById("myForm");
  var nameInput = form.elements["name"];
  var emailInput = form.elements["email"];
  
  var name = nameInput.value;
  var email = emailInput.value;
  
  // 处理提取的值
  console.log("姓名：" + name);
  console.log("邮箱：" + email);
  
  // 其他操作...
}