设置cookie时返回base64编码值(Javascript)

// 设置cookie
function setCookie(name, value, days) {
  var expires = "";
  if (days) {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    expires = "; expires=" + date.toUTCString();
  }
  var encodedValue = btoa(value); // 使用btoa()函数进行base64编码
  document.cookie = name + "=" + encodedValue + expires + "; path=/";
}

// 示例用法
setCookie("username", "John Doe", 7);