您需要调整的基本实现如下所示：

function insertParam(key, value)
{
    key = encodeURI(key); value = encodeURI(value);

    var kvp = document.location.search.substr(1).split('&');

    var i=kvp.length; var x; while(i--) 
    {
        x = kvp[i].split('=');

        if (x[0]==key)
        {
            x[1] = value;
            kvp[i] = x.join('=');
            break;
        }
    }

    if(i<0) {kvp[kvp.length] = [key,value].join('=');}

    //this will reload the page, it's likely better to store this until finished
    document.location.search = kvp.join('&'); 
}

这大约是正则表达式或基于搜索的解决方案的两倍，但是这完全取决于查询字符串的长度和任何匹配项的索引

我为完成测试而基准的慢速正则表达式方法（慢了大约+ 150％）

function insertParam2(key,value)
{
    key = encodeURIComponent(key); value = encodeURIComponent(value);

    var s = document.location.search;
    var kvp = key+"="+value;

    var r = new RegExp("(&|\\?)"+key+"=[^\&]*");

    s = s.replace(r,"$1"+kvp);

    if(!RegExp.$1) {s += (s.length>0 ? '&' : '?') + kvp;};

    //again, do what you will here
    document.location.search = s;
}