<script type="text/javascript">
                var url = window.location.href;
                url = changeURLArg(url, "key", "搜索值"),
                window.location.href = url;
                * url 目标url
                * arg 需要替换的参数名称
                * arg_val 替换后的参数的值
                * return url 参数替换后的url
                function changeURLArg(url, arg, arg_val) {
                    var pattern = arg + '=([^&]*)';
                    var replaceText = arg + '=' + arg_val;
                    if (url.match(pattern)) {
                        var tmp = '/(' + arg + '=)([^&]*)/gi';
                        tmp = url.replace(eval(tmp), replaceText);
                        return tmp;
                    } else {
                        if (url.match('[\?]')) {
                            return url + '&' + replaceText;
                        } else {
                            return url + '?' + replaceText;
                    return url + '\n' + arg + '\n' + arg_val;
            </script>