我必须从 JMeter 中的响应（即 json）中提取多个相关变量。下面列出了部分响应：
[
{
"data": {
"id": "efaa6876-7a8d-4723-9d85-1ed99e822f06",
"type": "courses",
"attributes": {
"created-at": "2019-02-07T16:38:50.735Z",
"contents-count": 267,
"units": [
{
"id": "31b5fcb1-24ee-441e-a0ee-ca859fc9a89d",
"position": null,
"progress": 0,
"completed": false,
"show_name": false,
"node_id": "1",
"children": [
{
"id": "b8ed75a3-0390-4273-82c3-03ee6eba729c",
"position": null,
"image": null,
"progress": 0,
"completed": false,
"show_name": true,
"node_id": "2",
"children": [],
"contents": [
{
"id": "fa1bdc2f-4330-425c-9c10-3734d07125aa",
"link": {
"url": "#",
"target": "_blank",
"class": "learning-object-link",
"data": {
"id": "fa1bdc2f-4330-425c-9c10-3734d07125aa",
"user-role": "teacher",
"open-method-tablet": "newtab",
"open-method-desktop": "modal",
"content-open-method": null,
"modal-size-method": "fully_responsive",
"fixed-width": null,
"fixed-height": null,
"aspect-ratio": null
}
},
"is_work": false,
"is_fun": false,
"completed": false,
"total_activities": 2,
"completed_activities": 0,
"progress": 0,
"updated_at": false,
"attempts": 0,
"duration": null
},
{
"id": "ceceabfd-5151-4656-af5d-3392c5a4c04c",
"link": {
"url": "#",
"target": "_blank",
"class": "learning-object-link",
"data": {
"id": "ceceabfd-5151-4656-af5d-3392c5a4c04c",
"user-role": "teacher",
"open-method-tablet": "newtab",
"open-method-desktop": "modal",
"content-open-method": null,
"modal-size-method": "fully_responsive",
"fixed-width": null,
"fixed-height": null,
"aspect-ratio": null
}
},
"is_work": false,
"is_fun": false,
"completed": false,
"total_activities": 2,
"completed_activities": 0,
"progress": 0,
"updated_at": false,
"attempts": 0,
"duration": null
}
]
},
{
"id": "60639cbd-f872-492d-b8e9-db83f8789fcf",
"position": null,
"image": null,
"progress": 0,
"completed": false,
"show_name": true,
"node_id": "3",
"children": [],
"contents": [
{
"id": "1825f834-7099-4bb4-b7a2-fc634faffc86",
"link": {
"url": "#",
"target": "_blank",
"class": "learning-object-link",
"data": {
"id": "1825f834-7099-4bb4-b7a2-fc634faffc86",
"user-role": "teacher",
"open-method-tablet": "newtab",
"open-method-desktop": "modal",
"content-open-method": null,
"modal-size-method": "fully_responsive",
"fixed-width": null,
"fixed-height": null,
"aspect-ratio": null
}
},
要继续下一个请求，我必须提取单元 id（例如 31b5fcb1-24ee-441e-a0ee-ca859fc9a89d）、儿童 id（例如 b8ed75a3-0390-4273-82c3-03ee6eba729c）和内容 id（例如 fa1bdc2f-4330-425c -9c10-3734d07125aa)。有几个单元，每个单元有几个孩子，每个孩子有几个内容。每个内容 id 只匹配一个孩子 id，每个孩子 id 只匹配一个单元 id。必须随机选择 ID。
我试图从响应中提取所有 id 并随机使用它们，但它不能以这种方式工作。
