js给当前url添加get参数，兼容旧参数

example

updateQueryStringParameter("https://www.baidu.com?a=123",'b','hello')
//result
https://www.baidu.com/?a=123&b=hello

function updateQueryStringParameter(uri, key, value) {
    if (!value) {
        return uri;
    }

    // var reg1 = new RegExp("/" + key + "=.*?(&?)/", "g"); // 加'g'，删除字符串里所有的"a"
    // var url2 = uri.replace(reg1, "");
    //
    // alert(url2);

    let url = new URL(uri);
    //let inputParams = new URLSearchParams(inputUrl.search);
    //console.log("The parameters of the url is defined as: ", inputParams)
    url.searchParams.delete(key);
    url.searchParams.append(key, value);
    //inputParams.append(key, value);
    //alert(url);
    //alert(url)
    return url;
    var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
    var separator = uri.indexOf('?') !== -1 ? "&" : "?";
    if (uri.match(re)) {
        return uri.replace(re, '$1' + key + "=" + value + '$2');
    } else {
        return uri + separator + key + "=" + value;
    }
}