Edit in JSFiddle

var app = angular.module('MyApp', []);

app.controller('testC',function($scope,$location){
    $scope.getUrl = function(el){
    	alert($location.absUrl());
    }
});

<div ng-app="MyApp">
<div ng-controller="testC">
    <button ng-click="getUrl()">获取地址</button>
</div>
</div>