JavaScript不刷新查找当前网址上的querystring并修改查询字符串变量

http://ourjs.com?param1=test1&param2=test2

var qs = {}

qs.get = function(name) {
  var reg = new RegExp("[?&#]" + name + "=[^$&]*");
  var parameter = location.href.match(reg)
  if (!parameter) {
    return;
  } 

  return decodeURIComponent(parameter[0].substr(name.length + 2));
}

qs.set = function(name, value) {
  var reg = new RegExp("([?&#]" + name + "=)[^$&]*")
  var url = location.href
  var parameter = url.match(reg)
  if (parameter) {
    url = url.replace(reg, '$1' + value)
  } else {
    var first = url.indexOf('#') > 0 ? '' : '#'
    url += (url.indexOf('=') > 0 ? '&' : first) + name + '=' + value
  }

  history.replaceState && history.replaceState(null, null, url)
}

$.qs = qs;

qs.get('param1')
> test1

qs.set('param1', 'newvalue')
# 当前网址更新为:  http://ourjs.com?param1=newvalue&param2=test2