使用

var url = window.location;
let params = new URLSearchParams(url.search);
let nr = params.has('nr')

因为window.location是具有 .search 财产
而window.location.href是一个字符串，没有 .search 财产
所以你 url.search 是 undefined 我可以用它来演示 URL 类似于 Location 在这方面

let loc = new URL('http://example.com/?nr=1');

// loc is a placeholder for your window.location

let url = loc.href;

// here, url.search would be window.location.href.search
let params = new URLSearchParams(url.search);
let nr = params.has('nr')
console.log(nr);

url = loc;

// here, url.search would be window.location.search
params = new URLSearchParams(url.search);
nr = params.has('nr')
console.log(nr);

从…起https://developer.mozilla.org/en-us/docs/web/api/urlsearchparams The URLSearchParams constructor does not parse full URLs. However, it will strip an initial leading ? off of a string, if present. 因此，您应该只提供查询参数字符串。
e、 g.如果您的window.location.href

https://stackoverflow.com/questions/68314446/get-url-parameter-with-javascript?query=1&query_1=2&many_queries=3

然后您应该只传递查询参数urlsearchparams类，即 query=1&query_1=2&many_queries=3

下面的函数将从url返回所有参数的数组

function getUrlVars() {
    var vars = {};
    var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi,    
    function(m,key,value) {
      vars[key] = value;
    });
    return vars;
  }

  var params = getUrlVars();

  console.log(params["nr"]);

引用自https://stackoverflow.com/a/20097994/8077687