function getParam(url, name) {
  try {
      var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
      var r = url.split('?')[1].match(reg);
      if(r != null) {
        return r[2];
      }
      return "";//如果此处只写return;则返回的是undefined
  } catch(e) {
      return "";//如果此处只写return;则返回的是undefined
  }
};

console.log(getParam(window.location.href, 'authorization'))