angular.js - How to get the url of the previous page in angular

Question

I want to know which page the current page was jumped from. What should I do? I used ui-router to print out $state but I couldn’t find any relevant content

Answer 1

    rootScope.$on('$stateChangeSuccess', function (ev, to, toParams, from, fromParams) {
        $rootScope.previousState = from;
        $rootScope.previousParams = fromParams;
    });

Answer 2

$state.current