如何在AngularJs中存储和读取会话(值)？

我在存储时遇到麻烦并且使用了读取会话数据Angularjs.单击按钮后,emp_name应该存储,session以及如何从中读取存储的emp_name session.

样品在plnkr中

// Code goes here

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

app.controller('Ctrl', function($scope) {
  $scope.employee = [{
      emp_id: 1,
      emp_name: 'Jes',
      emp_cont:9876543445
    }, {
      emp_id: 2,
      emp_name: 'Sandy',
      emp_cont:3553454345
    }, {
      emp_id: 3,
      emp_name: 'Alex',
      emp_cont:9343434345
    }, {
      emp_id: 4,
      emp_name: 'Nancy',
      emp_cont:9876543445
    }, {
      emp_id: 5,
      emp_name: 'Scott',
      emp_cont:9834564455
    }
  ];
  
          $scope.returnRefId = function (emp) {           
            try {
                  //  test emp
                  alert(emp);
                  // session code here
                  
            }
            catch (e) {
                  alert("some errror");
            }
        };
});

ul li{list-style:none;float:left;padding:10px;border:1px solid #ddd;height:20px;width:100px}
ul{clear:both}
label{color:red}

  
  
  



  

    
{{employees.emp_id}} 
    
{{employees.emp_name}} 
    
{{employees.emp_cont}} 
    
Add Session
    
  
  



  How to store and read emp_name thru only session

$scope.returnRefId = function (emp) {           
        try {
              //  test emp
              alert(emp);
              // session code here
              sessionStorage.setItem("emp-key", JSON.stringify(emp));
        }
        catch (e) {
              alert("some errror");
        }
 };