我有一个json，我使用primeng树填充组件，我想只提取“标签”值（这三个节点）。
我想在树中添加类别标签时进行自动完成输入，用户可以选择类别所在的父级（这将使用父路径自动完成）
我如何提取和输出如下： 文件 - ＆gt;工作
文件 - ＆gt;家
图片
依旧...... ??
{
"data":
[
{
"label": "Documents",
"data": "Documents Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{
"label": "Work",
"data": "Work Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{"label": "Expenses.doc", "icon": "fa-file-word-o", "data": "Expenses Document"}, {"label": "Resume.doc", "icon": "fa-file-word-o", "data": "Resume Document"}]
},
{
"label": "Home",
"data": "Home Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{"label": "Invoices.txt", "icon": "fa-file-word-o", "data": "Invoices for this month"}]
}]
},
{
"label": "Pictures",
"data": "Pictures Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [
{"label": "barcelona.jpg", "icon": "fa-file-image-o", "data": "Barcelona Photo"},
{"label": "logo.jpg", "icon": "fa-file-image-o", "data": "PrimeFaces Logo"},
{"label": "primeui.png", "icon": "fa-file-image-o", "data": "PrimeUI Logo"}]
},
{
"label": "Movies",
"data": "Movies Folder",
"expandedIcon": "fa-folder-open",
"collapsedIcon": "fa-folder",
"children": [{
"label": "Al Pacino",
"data": "Pacino Movies",
"children": [{"label": "Scarface", "icon": "fa-file-video-o", "data": "Scarface Movie"}, {"label": "Serpico", "icon": "fa-file-video-o", "data": "Serpico Movie"}]
},
{
"label": "Robert De Niro",
"data": "De Niro Movies",
"children": [{"label": "Goodfellas", "icon": "fa-file-video-o", "data": "Goodfellas Movie"}, {"label": "Untouchables", "icon": "fa-file-video-o", "data": "Untouchables Movie"}]
}]
}
]
}