javascript 修改 url 参数

来源：https://stackoverflow.com/questions/486896/adding-a-parameter-to-the-url-with-javascript 参考：https://www.tutorialspoint.com/how-to-add-a-parameter-to-the-url-in-javascript

var url = new URL("http://foo.bar/?x=1&y=2");

// If your expected result is "http://foo.bar/?x=1&y=2&x=42"
url.searchParams.append('x', 42);

// If your expected result is "http://foo.bar/?x=42&y=2"
url.searchParams.set('x', 42);

xurl = url.toString();
// 或者 xurl = url.href;