Get People Picker value

This is first time i use people picker. I have no experince with it. I hope that somebody can help me with getting the value of people picker to save new item as a person in my list. this is my code...

$(document).ready(function () { initializePeoplePicker('peoplePickerDiv'); } function initializePeoplePicker(peoplePickerElementId) {

var schema = {};
schema['PrincipalAccountType'] = 'User,DL,SecGroup,SPGroup';
schema['SearchPrincipalSource'] = 15;
schema['ResolvePrincipalSource'] = 15;
schema['AllowMultipleValues'] = true;
schema['MaximumEntitySuggestions'] = 50;
schema['Width'] = '280px';

this.SPClientPeoplePicker_InitStandaloneControlWrapper(peoplePickerElementId, null, schema);

}

function getUserInfo() { var peoplePicker = this.SPClientPeoplePicker.SPClientPeoplePickerDict.peoplePickerDiv_TopSpan; var users = peoplePicker.GetAllUserInfo();

var userInfo = '';
for (var i = 0; i < users.length; i++) {
    var user = users[i];
    for (var userProperty in user) {
        userInfo += userProperty + ':  ' + user[userProperty] + '<br>';
    }
}
$('#resolvedUsers').html(userInfo);

var keys = peoplePicker.GetAllUserKeys();
$('#userKeys').html(keys);

}

function AnsokSemester() { var createInfo = SP.ListItemCreationInformation(); var listItem = Semesterlist.addItem(createInfo);

listItem.set_item("lfua", **????**);

listItem.update();
clientContext.load(listItem);
clientContext.executeQueryAsync(OnsSuccAnsok, OnFail);

}

THE QUSTUION MARKS WITH THE BOLD FONT WHAT I WANT THANK YOU SO MUCH