如何从分组选项select2中删除重复标记?

感谢cmgches提出了一个解决方案,在选项中添加组名。

var tagsCat1 = [
  "AAA",
  "BBB",
  "CCC"
];

var childrenCat1 = [];
for (var i = 0; i < tagsCat1.length; i++) {
  childrenCat1.push({
    id: "Cat1: " + tagsCat1[i],
    text: "Cat1: " + tagsCat1[i]   // could be just tagsCat1[i]
  });
}

var tagsCat2 = [
  "DDD",
  "EEE",
  "BBB"     // duplicate tag 
];

var childrenCat2 = [];
for (var i = 0; i < tagsCat2.length; i++) {
  childrenCat2.push({
    id: "Cat2: " + tagsCat2[i],
    text: "Cat2: " + tagsCat2[i]   // could be just tagsCat2[i]
  });
}

var options = [];
options.push({text: "Cat1", children: childrenCat1});
options.push({text: "Cat2", children: childrenCat2});

$('#example1').select2({
  data: options,
  tags: true,
  multiple: true,
  allowClear: true,
  placeholder: 'select...',
});