JS获取URL参数

var getParam = function(name){
        var search = document.location.search;
        var pattern = new RegExp("[?&]"+name+"\=([^&]+)", "g");
        var matcher = pattern.exec(search);
        var items = null;
        if(null != matcher){
                try{
                        items = decodeURIComponent(decodeURIComponent(matcher[1]));
                }catch(e){
                        try{
                                items = decodeURIComponent(matcher[1]);
                        }catch(e){
                                items = matcher[1];
                        }
                }
        }
        return items;
};