存储JavaScript表单中的值

var username = document.getElementById("username").value;
var password = document.getElementById("password").value;

var checkboxes = document.getElementsByName("checkbox");
var selectedValues = [];

for (var i = 0; i < checkboxes.length; i++) {
  if (checkboxes[i].checked) {
    selectedValues.push(checkboxes[i].value);
  }
}

var formData = {
  username: document.getElementById("username").value,
  password: document.getElementById("password").value
};