思维导图 办公辅助 在线绘制思维导图 思维导图 JSON（结构：node/children） { "meta":{ "name":"思维导图","author":"toolbox","version":"1.0" }, "format":{ "space":2 }, "data":{ "nodearr":[ {"id":"root","topic":"中心主题","direction":0}, {"id":"sub1","topic":"分支一","parentId":"root"}, {"id":"sub2","topic":"分支二","parentId":"root"}, {"id":"sub1-1","topic":"子项 1","parentId":"sub1"} ]} } 渲染 在选中节点加子节点