jQuery select2第4版初始选择，怎么样？

Question

我在文字输入上有一个select2，可以选择多个     

我无法弄清楚如何设置它的初始值，我有以下代码。任何指针都会受到赞赏。谢谢。

var $select = $('#cc_list');

    $select.select2({
        placeholder: "Search CC list",
        minimumInputLength: 1,
        ajax: { // instead of writing the function to execute the request we use Select2's convenient helper
            url: "../ajax/employee-select2.php",
            dataType: 'json',
            quietMillis: 250,
            data: function (term, page) {
                return {
                    query: term, // search term
                };
            },
            results: function (data, page) { // parse the results into the format expected by Select2.
                return { results: data };
            },
            cache: true
        },
         multiple: true,
         maximumSelectionSize: 5,
        dropdownCssClass: "bigdrop", 
        escapeMarkup: function (m) { return m; } 
    });

    $select.val('val1, val2').trigger('change');