在不删除现有Url参数的情况下更新或添加url参数

function updateUrlParameter(url, key, value) {
  var urlParts = url.split('?');
  var baseUrl = urlParts[0];
  var queryParams = urlParts[1] ? urlParts[1].split('&') : [];

  // Check if the parameter already exists
  var parameterExists = false;
  for (var i = 0; i < queryParams.length; i++) {
    var param = queryParams[i].split('=');
    if (param[0] === key) {
      param[1] = value;
      queryParams[i] = param.join('=');
      parameterExists = true;
      break;
    }
  }

  // If the parameter doesn't exist, add it
  if (!parameterExists) {
    queryParams.push(key + '=' + value);
  }

  // Reconstruct the URL
  var updatedUrl = baseUrl + '?' + queryParams.join('&');

  return updatedUrl;
}

// Example usage
var currentUrl = window.location.href;
var updatedUrl = updateUrlParameter(currentUrl, 'newParam', 'newValue');
console.log(updatedUrl);