$location

                    controller("ctrl", ["$scope", "$location", function ($scope, $location) {
                        //hash pattern 是 originUrl + "#/path?paraKey"
                        //$location 是同步当前url的，所以你set paraKey 等都会改变 url
                        //start url : http://localhost:5715/Angularjs/location/Default.aspx
                        var location_obj = $location.url("/path?x=y y"); //添加 hash, #/path?x=y 到url最后, 返回$location对象                       
                        //now url : http://localhost:5715/Angularjs/location/Default.aspx#/path?x=y%20y
                        var afterHash_str = $location.url(); //返回hash#后面的str : /path?x=y%20y (加密)   
                        var currentUrl = $location.absUrl(); //location.href. (加密)     
                        var http = $location.protocol(); //location.protocol
                        var host = $location.host(); //location.host
                        var port = $location.port(); //location.port
                        var path = $location.path(); //返回#之后的/path, without paraKey
                        var hash = $location.hash(); //不会  
                        var paraKeys = $location.search(); //返回paraKey对象，(解密)
                        $location.search({ x: "z z 1", y: "abc" }); //add and overwrite paraKey , cant clear
                        $location.search("y", null); //clear a paraKey
                    }]);