The People Picker gets its value from the JQuery SP 2013 form

How to get value People Picker JQuery SP 2013? Does not my code work ((

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function _spBodyOnLoad () {
var pickerPeople = SPClientPeoplePicker.SPClientPeoplePickerDict['User'].GetAllUserInfo ();
if (pickerPeople.length> 0) {
alert ("User:" + pickerPeople[0].DisplayText);
}}