获取 url 问号后的参数

function getQueryString(url:string, name:string) {
  var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
  var r = url.substr(1).match(reg);
  if (r != null) {
      return unescape(r[2]);
  }
  return null;
}

getQueryString('?id=1', 'id')