javascript how to get current url parameters jquery and replace them code example

Example 1: js update query string

var searchParams = new URLSearchParams(window.location.search);
searchParams.set("foo", "bar");
window.location.search = searchParams.toString();

Example 2: js add query param

function setParam(uri, key, val) {
    return uri
        .replace(RegExp("([?&]"+key+"(?=[=&#]|$)[^#&]*|(?=#|$))"), "&"+key+"="+encodeURIComponent(val))
        .replace(/^([^?&]+)&/, "$1?");
}