未捕获的ReferenceError：未定义country2

Question

在这种情况下，当我点击按钮然后显示

  

错误未捕获的ReferenceError：未定义country2。

你能帮我解决这个错误吗？

var country2 = document.getElementById("cntry1").value;
var state2 = document.getElementById("state1").value;

$.ajax({
      url: "ajax.php",
      type: "POST",
      data: {
        get_data: 'get_data',
        name: name,
        number: number,
        address: address,
        hobbies: hobbies,
        redio: redio,
        country12: country2,
        state12: state2
      },
      dataType: "text",