Url parameter serialized and parsed

urlUtil.js

/**
 * @param jsonObj {Object} Sample: { name: 'wangpin', job: 'engineer' }
 * @return params {String} Sample: name=wangpin&job=engineer
 */
function stringifyParams(jsonObj) {
  if(typeof jsonObj !== 'object' || !(jsonObj instanceof Object)){
    throw new Error('Not a valid json object');
  }
  var result = [];
  for (var x in jsonObj) {
    result.push(x + '=' +　jsonObj[x]);
  }
  return result.join('&');
}

/**
 * @param paramStr {String} Sample: name=wangpin&job=engineer
 * @return param {Object} Sample: { name: 'wangpin', job: 'engineer' }
 */
function parseParams(paramStr) {
  if(typeof paramStr !== 'string'){
    throw new Error('Not a str');
  }
  var reg = /([^=]+)=([^=&]*)/ig;
  var obj = {};
  var result;
  while ((result = reg.exec(paramStr))) {
    obj[result[1]] = result[2];
  }
  return obj;
}

/**
 * @param url {String} Sample: http://app.com/index?name=wangpin&job=engineer#page
 * @return paramStr {String} Sample: name=wangpin&job=engineer
 */
function getParamsStr(url) {
  if(typeof url !== 'string'){
    throw new Error('Not a string');
  }
  var reg = /\?([^\?\#]+)#?/ig;
  var result = reg.exec(url);
  if (result && result[1]) {
    return result[1];
  }
  return '';
}