问jQuery UI自动完成- that._renderItemData不是一个函数

EN

jQuery(document).ready(function($) {

$.widget( "custom.catcomplete", $.ui.autocomplete, {
    _renderMenu: function( ul, items ) {
        var that = this,
            currentCategory = "";
        $.each( items, function( index, item ) {
            if ( item.category != currentCategory ) {
                ul.append( "<li class='ui-autocomplete-category'>" + item.category + "</li>" );
                currentCategory = item.category;
            }
            that._renderItemData( ul, item );
        });
    }
});     

$(function() {
    var data = [
        { label: "anders", category: "" },
        { label: "andreas", category: "" },
        { label: "antal", category: "" },
        { label: "annhhx10", category: "Products" },
        { label: "annk K12", category: "Products" },
        { label: "annttop C13", category: "Products" },
        { label: "anders andersson", category: "People" },
        { label: "andreas andersson", category: "People" },
        { label: "andreas johnson", category: "People" }
    ];

    $( "#search" ).catcomplete({
        delay: 0,
        source: data
    });

});

 var that = $(this)

var that = jQuery(this)