zTree 实现点击input框出现下拉菜单（亲测可用）

jQuery Tree Plugin ---- zTree ============ last verson : 3.5.40 **Donate to zTree** : http://www.treejs.cn/v3/donate.php zTree API : http://www.treejs.cn/v3/api.php zTree Demo : http://www.treejs.cn/v3/demo.php ### INSTALL ``` npm install @ztree/ztree_v3 ``` Introduction of zTree (简介) ============ * zTree is a multi-functional "tree plug-ins." based on jQuery. The main advantages of zTree includes excellent performance, flexible configuration, and the combination of multiple functions. (zTree 是一个依靠 jQuery 实现的多功能 “树插件”。优异的性能、灵活的配置、多种功能的组合是 zTree 最大优点。) * zTree is a free tree plug-in and uses the MIT license. (zTree 是开源免费的软件, 使用 MIT 许可证) * The code of zTree v3.x has been seperated according to the various functions. You can only load the code you need. (zTree v3.x 将核心代码按照功能进行了分割，不需要的代码可以不用加载) * zTree v3.x uses delay loading technique, which can easily load tens of thousands of nodes in seconds even in IE6 browser. (采用了 延迟加载 技术，上万节点轻松加载，即使在 IE6 下也能基本做到秒杀) * Compatible with IE, FireFox?, Chrome, Opera, Safari and other browsers. (兼容 IE、FireFox?、Chrome、Opera、Safari 等浏览器) * Support for JSON data. (支持 JSON 数据) * Support for static and asynchronous data loading node. (支持静态 和 Ajax 异步加载节点数据) * Replace the skin / custom icon flexibllly. (支持任意更换皮肤 / 自定义图标) * Support extremely flexible checkbox or radio selection function. (支持极其灵活的 checkbox 或 radio 选择功能) * Provide enough incident response callback. (提供多种事件响应回调) * Flexible editing (add / delete / change / search) functions, such as drag and drop nodes,you can even drag and drop multiple nodes. (灵活的编辑（增/删/改/查）功能，可随意拖拽节点，还可以多节点拖拽哟) * Enable to generate multiple instances of zTree in one page. (在一个页面内可同时生成多个 Tree 实例) * Simple parameters to achieve flexible configuration capabilities. (简单的参数配置实现 灵活多变的功能) * To enhance performance, zTree transforms the js & css structure to provide excellent browser compatibility and make the development more easily (zTree v3.x（JQuery Tree 插件），性能全面提升，js & css 架构全面调整，提供更好的兼容性和易开发性)