JS置換URLにおけるパラメータ例

                <span style="color:#0000ff;">var</span> url =<span style="color:#000000;"> window.location.href;
                url </span>= changeURLArg(url, "key", "   "<span style="color:#000000;">),
                window.location.href </span>=<span style="color:#000000;"> url;

                </span><span style="color:#008000;">/*</span><span style="color:#008000;">
                * url   url
                * arg          
                * arg_val         
                * return url       url
                </span><span style="color:#008000;">*/</span>
                <span style="color:#0000ff;">function</span><span style="color:#000000;"> changeURLArg(url, arg, arg_val) {
                    </span><span style="color:#0000ff;">var</span> pattern = arg + '=([^&]*)'<span style="color:#000000;">;
                    </span><span style="color:#0000ff;">var</span> replaceText = arg + '=' +<span style="color:#000000;"> arg_val;
                    </span><span style="color:#0000ff;">if</span><span style="color:#000000;"> (url.match(pattern)) {
                        </span><span style="color:#0000ff;">var</span> tmp = '/(' + arg + '=)([^&]*)/gi'<span style="color:#000000;">;
                        tmp </span>=<span style="color:#000000;"> url.replace(eval(tmp), replaceText);
                        </span><span style="color:#0000ff;">return</span><span style="color:#000000;"> tmp;
                    } </span><span style="color:#0000ff;">else</span><span style="color:#000000;"> {
                        </span><span style="color:#0000ff;">if</span> (url.match('[\?]'<span style="color:#000000;">)) {
                            </span><span style="color:#0000ff;">return</span> url + '&' +<span style="color:#000000;"> replaceText;
                        } </span><span style="color:#0000ff;">else</span><span style="color:#000000;"> {
                            </span><span style="color:#0000ff;">return</span> url + '?' +<span style="color:#000000;"> replaceText;
                        }
                    }
                    </span><span style="color:#0000ff;">return</span> url + '
' + arg + '
' +<span style="color:#000000;"> arg_val;
                }
            </span>