fineui是帆软报表和BI产品线所使用的前端框架。
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# bi.level_tree
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### 二级树
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{% method %}
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[source](https://jsfiddle.net/fineui/nvvkwhfo/)
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{% common %}
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```javascript
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var tree = BI.createWidget({
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type: "bi.level_tree",
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element: 'body',
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items: [],
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});
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```
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{% endmethod %}
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### 参数设置
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| 参数 | 说明 | 类型 | 默认值 |
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| -------- | ----------------- | ------ | ---- |
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| expander | branch_expander配置 | object | {} |
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| items | 元素 | array | [] |
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### 方法
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| 方法名 | 说明 | 参数 |
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| -------------- | -------- | ----------- |
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| initTree | 构造树结构 | nodes |
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| stroke | 生成树方法 | nodes |
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| populate | 去掉所有内容 | items: 子项数组 |
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| setValue | 设置值 | v |
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| getValue | 获得值 | — |
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| getAllLeaves | 获取所有叶节点 | — |
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| getNodeById | 根据Id获取节点 | id |
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| getNodeByValue | 根据值获取节点 | id |
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------
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