函数被调用，而不是执行

Question

给出一些传递的URL参数： /login.jsp?requestinfo=username

几乎所有东西似乎都运行良好但是当我调用showRequestInfo函数时它不会执行。它没有接收传递给它的参数。为什么这可能失败？

JS：

function LoginView(model, options) {
this.LoginModel = model;
this.bindEvents();
this.GetURLParameter();
}

//check for parameters being passed
//if params. are present show requested screen
LoginView.prototype.GetURLParameter = function (sParam) {
var sPageURL = window.location.search.substring(1);
var sURLVariables = sPageURL.split('&');
for (var i = 0; i < sURLVariables.length; i++) {
    var sParameterName = sURLVariables[i].split('=');
    if (sParameterName[0] == sParam) {
        return sParameterName[1]; 
    }
}
   this.showRequestInfo(UrlParameter);
};

LoginView.prototype.showRequestInfo = function (sParam) {

var UrlParameter = GetURLParameter('requestinfo');
if (UrlParameter == 'username') {

    var getMyUsername = $('#getmyusername');

    if (getMyUsername.hasClass('notvisible')) {
        $('#logincontainer').animate({'left':'-280px'}, 'fast');
        $('#logincontainer').removeClass('visible');
        $('#logincontainer').addClass('notvisible');                
        getMyUsername.removeClass('notvisible');
        getMyUsername.animate({'left':'35px'}, 'slow').addClass('visible');             
    }
}

else if (UrlParameter == 'password') {

    var getMyPassword = $('#getmypassword');

    if (getMyPassword.hasClass('notvisible')) {
        $('#logincontainer').animate({'left':'-280px'}, 'fast');
        $('#logincontainer').removeClass('visible'); 
        $('#logincontainer').addClass('notvisible');               
        getMyPassword.removeClass('notvisible');
        getMyPassword.animate({'left':'35px'}, 'slow').addClass('visible');             
    }
} 

};

为什么我的showRequestInfo函数没有被执行？