JavaScript-use PHP to get a final URL via JS jump

The address is: Http://prosperent.com/store/product/411677-18579-0/?k=CARDINAL+12132+E ...

Final address: Http://www.walmart.com/ip/Cardinal-Brands-Inc-Clearvue-EasyOpen-Extra-...

Use is this section JS jump, helpless don't understand JS, don't know

        var getParams = function()        {            var params = {};            window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m, key, value) {                params[key] = value;            });            return params;        };

Reply content:

The address is: Http://prosperent.com/store/product/411677-18579-0/?k=CARDINAL+12132+E ...

Final address: Http://www.walmart.com/ip/Cardinal-Brands-Inc-Clearvue-EasyOpen-Extra-...

Use is this section JS jump, helpless don't understand JS, don't know

        var getParams = function()        {            var params = {};            window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m, key, value) {                params[key] = value;            });            return params;        };

getParams()is to extract the querystring inside the URL, for example:

'?a=1&b=2' => { a: '1', b: '2' }

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