获取javascript cookie过期时间值(分钟)

function getCookieExpirationTime(cookieName) {
  var cookies = document.cookie.split(';');
  var expirationTime;

  for (var i = 0; i < cookies.length; i++) {
    var cookie = cookies[i].trim();

    if (cookie.indexOf(cookieName + '=') === 0) {
      var cookieValue = cookie.substring(cookieName.length + 1);
      var matches = cookieValue.match(/expires=([^;]+)/i);

      if (matches) {
        var expirationDateString = matches[1];
        var expirationDate = new Date(expirationDateString);
        var currentTime = new Date();

        if (expirationDate > currentTime) {
          var timeDifference = expirationDate.getTime() - currentTime.getTime();
          expirationTime = Math.ceil(timeDifference / 60000); // 转换为分钟
        }
      }

      break;
    }
  }

  return expirationTime;
}

// 使用示例
var cookieName = 'exampleCookie';
var expirationTime = getCookieExpirationTime(cookieName);
console.log('过期时间（分钟）：', expirationTime);