JS获取URL参数方法

 //js get url param        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;        };

getParam('PId');