tree select

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                        "label": "a-b-a",
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                        "label": "b-b-d",
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                    {
                        "label": "b-b-d",
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                    }
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            {
                "label": "没有子元素",
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默认
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<br>
赋值
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<br>
单选
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<br>
定宽
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