写一个获取当前url查询字符串中的参数的方法

function params() {  const search = window.location.search;  search = search.substr(1, search.length);  const res = {};  if (!search) return res;  search.split('&').map(item => {    const [key, value] = item.split('=');    res[key] = depreURIComponent(value);  });  return res;}