login.po.js file is used as an Object Repository where you can add the page objects as well as the actions performed on that objects

login.po.js

/**
 * Created by Keshav on 6/9/2016.
 * login.po.js file 
 */

var loginPage = function(){
    var params = browser.params;

    //Object Locators
    function loginPage()
    {
        this.loginFame=element( by.css('[ng-click="loginDialog()"]') );  //Login Button Locator
        this.loginEmail=element(by.model('email'));  //Email Box Locator
        this.loginPassword=element(by.model('password')); //Password Box Locator 
        this.loginSubmit=element(by.css('[ng-click="submit()"]')); //Submit Button Locator
    }



    loginPage.prototype.manualLogin = function (userName , password) // No datatypes required
    {
        console.log("Entered inside manual--------- ");  //To print any desired value on Console
        this.loginFame.click(); //Perform Click on Famelogin
        this.loginEmail.sendKeys(userName); //Enters Username into Email field
        this.loginPassword.sendKeys(password); //Enters Password into Email field
        this.loginSubmit.click(); //Click on Submit Button
    };

   

    return loginPage;

}();
module.exports= loginPage; //To use the above mentioned function in another file