js 获取并解析 url 中参数的三种方法

function getUrlParam(name) {
  let params_str = location.search.substring(1);
  var reg = new RegExp(`(^|&)${name}=([^&]*)(&|$)`, "i");
  var result = params_str.match(reg);
  if (result === null) {
    return null;
  }
  // 对编码过 URI 进行解码
  return decodeURIComponent(result[2]);
}

function getUrlParam(name) {
  let pram = new URLSearchParams(location.search);
  return pram.get(name);
}

function getUrlParam(name) {
  let params_str = location.search.substring(1);
  let params_dic = {};
  params_str.split("&").forEach((item) => {
    let paramItem_list = item.split("=");
    if (paramItem_list.length === 2) {
      params_dic[paramItem_list[0]] = paramItem_list[1];
    }
  });
 
  return decodeURIComponent(params_dic[name]);
}