使用URL interface

const hello = 'max';
// let url = new URL(location.href); // from location.href
let url = new URL(`http://mywebsite.com/?par1=mynameis&par2=pedro&par3=nicetomeetyou`); // from string
url.searchParams.set('par2',hello); // change ONE parameter
console.log(url.searchParams.toString());
window.history.replaceState(null, null, `?${url.searchParams.toString()}`);

我更喜欢从完整的URL开始，但您可以使用URLSearchParams代替

const hello = 'max';
// let sp = new URLSearchParams(location.search); // from location.search
let sp = new URLSearchParams(`?par1=mynameis&par2=pedro&par3=nicetomeetyou`); 
sp.set('par2',hello); // change ONE parameter
console.log(sp.toString());
window.history.replaceState(null, null, `?${sp.toString()}`);

可以使用URLSearchParams：

const params = new URLSearchParams(window.location.search); // Creates search params object
params.set('par2', hello); // Set par2 to new value
window.history.replaceState(null, null, params.toString()); // Replace url

这可能不是理想的，但它有效。

var newpar2 = "max"
var newQueryStr = window.location.search.replace(/^(.+&par2=).+?(&.+)$/, `$1${newpar2}$2`)
window.history.replaceState(null, null, newQueryStr);