jquery select2设置选择的值

(function($){
selections = [
{id:1,text:'Enhancement'},
{id:2,text:'Bug'},
{id:3,text:'Duplicate'},
{id:4,text:'Invalid'},
{id:5,text:'Won\'t Fix'}
];

var extract_preselected_ids = function(element){
var preselected_ids = [];
if(element.val())
$(element.val().split(",")).each(function () {
preselected_ids.push({id: this});
});
console.log(preselected_ids);
return preselected_ids;
};

var preselect = function(preselected_ids){
var pre_selections = [];
for(index in selections)
for(id_index in preselected_ids)
if (selections[index].id == preselected_ids[id_index].id)
pre_selections.push(selections[index]);
return pre_selections;
};

$('#myselect-1').select2({
placeholder: 'Select Resources',
minimumInputLength: 0,
multiple: true,
allowClear: true,
data: function(){
return {results: selections}
},
initSelection: function(element, callback){
var preselected_ids = extract_preselected_ids(element);
var preselections = preselect(preselected_ids);
callback(preselections);
}
}).select2('val', [2,4,5]); // 2,4,5 are the pre-selected IDs

$('#myselect-2').select2({
placeholder: 'Select Resources',
minimumInputLength: 0,
multiple: true,
allowClear: true,
data: function(){
return {results: selections}
},
initSelection: function(element, callback){
var preselected_ids = extract_preselected_ids(element); //1,3,4 are the pre-selected IDs as per HTML attributes
var preselections = preselect(preselected_ids);
callback(preselections);
}
});
})(jQuery);