变量节点

{
  "varPath": "userName",
  "value": "张三"
}

{
  "varPath": "user.profile.age",
  "value": 25
}

{
  "varPath": "userList[0].status",
  "value": "active"
}

{
  "varPath": "result",
  "value": {
    "code": 200,
    "message": "success",
    "data": {
      "id": 123,
      "name": "测试数据"
    }
  }
}

{
  "varPath": "processedData",
  "value": "${input.data}"
}

{
  "code": 400,
  "msg": "Variable path not found: user.profile.invalid",
  "value": null
}

{
  "varPath": "data[${index}].result",
  "value": "computed_value"
}

{
  "varPath": "batch[${loop.index}].processed",
  "value": true
}

Condition → VarAction (满足条件时更新)
         → VarAction (不满足时更新其他变量)