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组件介绍：

ba-tree-picker 是一款uniapp树形层级选择器插件，picker弹窗形式的，样式和比例参照uniapp的picker和uni-data-picker组件。

• 支持单选、多选、父级选择，当然也支持单层选择
• 支持Object对象属性自定义映射
• 支持显示全部选中、部分选中、未选中三种状态
• 支持快速自定义简单样式（分割线、按钮、标题、对齐等），深入样式可复写css  

页面展示：

组件使用方法：

1. 下载后的文件放到 components 下（代码地址：https://gitee.com/shi_xiao_chen/multiple-selection-in-dropdown.git）
2. vue页面引入文件，并编写代码使用

import baTreePicker from "@/components/ba-tree-picker/ba-tree-picker.vue"export default {components: {baTreePicker}

3.在 script 中定义打开方法，和选择监听

        methods: {// 显示选择器showPicker() {this.$refs.treePicker._show();},//监听选择（ids为数组）selectChange(ids, names) {console.log(ids, names)}}//在 template 中调用打开<view @click="showPicker">调用选择器</view>

//listData放到data下的return中
listData = [{"value": "699791401616932870","label": "1","remark1": "42001","children": null},{"value": "699791401616932871","label": "2","remark1": "42002","children": null},{"value": "699791401616932872","label": "3","remark1": "42003","children": null},{"value": "699791401616932873","label": "4","remark1": "42004","children": null},{"value": "699791401616932874","label": "5","remark1": "42005","children": null},{"value": "699791401616932875","label": "6","remark1": "42006","children": null}
]

原组件借鉴地址：ba-tree-picker树形层级选择器（支持单选、多选、父级选择、映射） - DCloud 插件市场