javascript - Passing variables betweencontrollers in angular js -

i new angular js , services please bear basic question. please read comment inside code understand need.

 .controller('ctrlr1', function($scope, myservice) {      var = "abc";         })  .controller('ctrl2', function ($scope, myservice) {       // how value of   })  .service('myservice', function() {       //what goes here?  }); 

thanks in advance

basic sharing angular services

 .controller('ctrlr1', function($scope, myservice) {     var = "abc";     var b = 123;     myservice.mydata = a;     myservice.mydatab = b;   })   .controller('ctrl2', function ($scope, myservice) {     // how value of      console.log(myservice.mydata);     console.log(myservice.mydatab);   })   .service('myservice', function() {     //what goes here?     this.mydata = '';     this.mydatab = 0;   });