SOURCE

const curCollection = {
    "info": {
        "_postman_id": "d4147e0c-943c-4899-8d5b-e738e7109796",
        "name": "testBody",
        "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
    },
    "item": [
        {
            "name": "folder11",
            "item": [
                {
                    "name": "folder2",
                    "item": [
                        {
                            "name": "folder3",
                            "item": [
                                {
                                    "name": "3层",
                                    "request": {
                                        "method": "GET",
                                        "header": [],
                                        "body": {
                                            "mode": "raw",
                                            "raw": ""
                                        },
                                        "url": {
                                            "raw": "http://localhost:3000/api/requests",
                                            "protocol": "http",
                                            "host": [
                                                "localhost"
                                            ],
                                            "port": "3000",
                                            "path": [
                                                "api",
                                                "requests"
                                            ]
                                        }
                                    },
                                    "response": []
                                }
                            ],
                            "_postman_isSubFolder": true
                        },
                        {
                            "name": "11",
                            "request": {
                                "method": "POST",
                                "header": [],
                                "body": {
                                    "mode": "raw",
                                    "raw": ""
                                },
                                "url": {
                                    "raw": "baidu.com",
                                    "host": [
                                        "baidu",
                                        "com"
                                    ]
                                }
                            },
                            "response": []
                        }
                    ],
                    "_postman_isSubFolder": true
                },
                {
                    "name": "r1",
                    "request": {
                        "method": "DELETE",
                        "header": [],
                        "body": {
                            "mode": "raw",
                            "raw": ""
                        },
                        "url": {
                            "raw": "baidu.com",
                            "host": [
                                "baidu",
                                "com"
                            ]
                        },
                        "description": "11"
                    },
                    "response": []
                }
            ]
        },
        {
            "name": "folder2",
            "item": [
                {
                    "name": "f2-1",
                    "request": {
                        "method": "PUT",
                        "header": [],
                        "body": {
                            "mode": "raw",
                            "raw": ""
                        },
                        "url": {
                            "raw": "tieba.baidu.com",
                            "host": [
                                "tieba",
                                "baidu",
                                "com"
                            ]
                        }
                    },
                    "response": []
                },
                {
                    "name": "f2-2",
                    "request": {
                        "method": "POST",
                        "header": [],
                        "body": {
                            "mode": "raw",
                            "raw": ""
                        },
                        "url": {
                            "raw": "tieba.baidu.com",
                            "host": [
                                "tieba",
                                "baidu",
                                "com"
                            ]
                        }
                    },
                    "response": []
                }
            ]
        },
        {
            "name": "baidu.com",
            "event": [
                {
                    "listen": "prerequest",
                    "script": {
                        "id": "d1ad65b0-528d-4b3d-a119-24eb842f57c8",
                        "exec": [
                            "var a = 12;",
                            "var b= 13;"
                        ],
                        "type": "text/javascript"
                    }
                },
                {
                    "listen": "test",
                    "script": {
                        "id": "029cfa5c-4083-4f21-8e8a-6597382f5f9c",
                        "exec": [
                            "let i = 100;"
                        ],
                        "type": "text/javascript"
                    }
                }
            ],
            "protocolProfileBehavior": {
                "disableBodyPruning": true
            },
            "request": {
                "method": "GET",
                "header": [
                    {
                        "key": "Accept-Charset",
                        "value": "utf-8",
                        "type": "text",
                        "disabled": true
                    },
                    {
                        "key": "Content-Type",
                        "name": "Content-Type",
                        "value": "application/x-www-form-urlencoded",
                        "type": "text",
                        "disabled": true
                    }
                ],
                "body": {
                    "mode": "formdata",
                    "formdata": [
                        {
                            "key": "a",
                            "value": "11",
                            "type": "text"
                        }
                    ]
                },
                "url": {
                    "raw": "baidu.com?a=232",
                    "host": [
                        "baidu",
                        "com"
                    ],
                    "query": [
                        {
                            "key": "a",
                            "value": "232",
                            "description": "23232"
                        }
                    ]
                },
                "description": "111"
            },
            "response": []
        }
    ]
}
function generateUUID () {
  var d = new Date().getTime()
  var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
    var r = (d + Math.random() * 16) % 16 | 0
    d = Math.floor(d / 16)
    return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16)
  })
  return uuid
}
// tree扁平化
function compileFlattenTree (collection) {
let keyCounnter = 0
const flatTree = []
function flattenChildren (node, parent) {
    //node.nodeKey = keyCounnter++
    let n = keyCounnter++
    if (!node.nodeKey) {
      node.nodeKey = generateUUID()
    }
    flatTree[n] = {
      node: node,
      nodeKey: node.nodeKey
    }
    if(typeof parent != 'undefined'){
        flatTree[n].parent = parent.nodeKey
        flatTree[parent.nodeKey].children.push(node.nodeKey)
    }
    if (node.item && node.item.length > 0) {
        flatTree[n].children = []
        node.item.forEach(child => flattenChildren(child, node))
    }
}
if (!collection) {
    return []
} else {
    flattenChildren(collection)
}
return flatTree
}
let flatTree = compileFlattenTree(curCollection)
console.log(JSON.stringify(flatTree))