Js converts the received array to the desired format

has the following format 

{
    "2": {
        "id": 2,
        "name": "demo1",
        "lv1": {
            "4": {
                "id": 20,
                "name": "demo1-1",
                "lv2": {
                    "2": {
                        "id": 2,
                        "name": "demo1-1-1"
                    },
                    "3": {
                        "id": 3,
                        "name": "demo1-1-2"
                    }
                }
            },
            "7": {
                "id": 23,
                "name": "demo1-2"
            }
        }

    },

    "3": {
        "id": 4,
        "name": "demo2",
        "lv1": {
            "6": {
                "id": 34,
                "name": "demo2-1",
                "lv2": {
                    "3": {
                        "id": 3,
                        "name": "demo2-1-1"
                    }
                }
            },
            "8": {
                "id": 55,
                "name": "demo2-2"
            }
        }
    }
}

needs to be converted to this format 

[{
        "value": "2",
        "text": "demo1",
        "children": [{
            "value": "20",
            "text": "demo1-1",
            "children": [{
                    "value": "2",
                    "text": "demo1-1-1"
                },
                {
                    "value": "3",
                    "text": "demo1-1-2"
                }
            ]
        }]
    },
    {
        "value": "4",
        "text": "demo2",
        "children": [{
                "value": "34",
                "text": "demo2-1",
                "children": [{
                    "value": "3",
                    "text": "demo2-1-1"
                }]
            },
            {
                "value": "55",
                "text": "demo2-2"
            }
        ]
    }
]

requires that the value of the new data corresponds to the id of the original data. The novice debugged it for a whole day without any effect. Seek Daniel"s solution.

Javascript array
Mar.11,2021

it's messy. Please refer to

. 
var data = {
    "2": {
        "id": 2,
        "name": "demo1",
        "lv1": {
            "4": {
                "id": 20,
                "name": "demo1-1",
                "lv2": {
                    "2": {
                        "id": 2,
                        "name": "demo1-1-1"
                    },
                    "3": {
                        "id": 3,
                        "name": "demo1-1-2"
                    }
                }
            },
            "7": {
                "id": 23,
                "name": "demo1-2"
            }
        }

    },

    "3": {
        "id": 4,
        "name": "demo2",
        "lv1": {
            "6": {
                "id": 34,
                "name": "demo2-1",
                "lv2": {
                    "3": {
                        "id": 3,
                        "name": "demo2-1-1"
                    }
                }
            },
            "8": {
                "id": 55,
                "name": "demo2-2"
            }
        }
    }
};
function fn (obj) {
    var arr = [];
    for(var key in obj) {
        var child = null;
        for(var subKey in obj[key]) {
            if(/lv/.test(subKey)) {
                child = fn(obj[key][subKey]);
            }
        }
        if(child != null) {
            arr.push(
                {
                    "value": key,
                    "text": obj[key].name,
                    "children": child
                }
            );
        } else {
            arr.push(
                {
                    "value": key,
                    "text": obj[key].name
                }
            );
        }
    }
    return arr;
}

fn(data);

traverse the tree and regenerate the array. The front end does this work, which consumes a lot of performance. Especially when there is a large amount of data, it may get stuck. Generally, we let the back end deal with it and then give it to us

.

Previous: Some daily questions about java, about the annotations of the framework (ssh)

Next: How does Sublime3 detect regular expressions?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3110c-2bd59.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3110c-2bd59.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?