在多维JavaScript对象中查找最大/最小日期

Finding max/min date in multidimensional JavaScript object

本文关键字：日期查找 JavaScript 对象更新时间：2023-09-26

从下面的对象中找到最早开始日期和最晚结束日期的最简单方法是什么?

(对不起-我意识到有很多类似的问题已经在那里，但我的JS技能很差，我还没有能够将任何解决方案应用到我自己的数据。因此，话虽如此，一个代码示例肯定会帮助我在任何答案-谢谢!!)

var ganttData = [
    {
        "id": 123456,
        "name": "Sample Project",
        "start": new Date(2010,11,6),
        "end": new Date(2011,0,6),
        "status": "Not Started",
        "phase": [
            {
                "id": 123457,
                "name": "Sample Phase",
                "start": new Date(2010,11,6),
                "end": new Date(2010,11,13),
                "status": "Not Started",
                "task": [
                    {
                        "id": 123458,
                        "name": "Sample Task",
                        "start": new Date(2010,11,6),
                        "end": new Date(2010,11,8),
                        "status": "Not Started"
                    }
                ]
            },
            {
                "id": 123459,
                "name": "Another Phase",
                "start": new Date(2010,11,13),
                "end": new Date(2011,0,20),
                "status": "Not Started"
            }
        ]
    }
]

您可以简单地递归遍历树

var max = new Date(-100000000*86400000);
var min = new Date( 100000000*86400000);
function compare(key,value) {
    if (key == "start" && value < min)
        min=value;
    else if (key == "end" && value > max)
        max=value;
}
function traverse(obj, fun) {
    for (prop in obj) {
        fun.apply(this,[prop, obj[prop]]);   
        if (typeof(obj[prop]) == "object") {
            traverse(obj[prop], fun);
        }
    }
}
traverse(ganttData, compare);
> max
Thu Jan 20 2011 00:00:00 GMT+0100 (W. Europe Standard Time)
> min
Mon Dec 06 2010 00:00:00 GMT+0100 (W. Europe Standard Time)

上述工作直到您将开始和结束从Date更改为string。现在你需要做这样的事情

arr = "2010,11,13".split(",");
date = new Date(arr[0], arr[1], arr[2]);

我从JavaScript参考中得到了颠倒的最小和最大日期。

function getEarliestAndLatest(ganttData) {
    var earliest = ganttData.start,
        latest   = ganttData.end,
        phase,
        task;
    for (var i = 0, countPhases = ganttData.phase.length; i < countPhases; i++) {
        phase = ganttData.phase[i];
        if (phase.start < earliest) {
            earliest = phase.start;
        }
        if (phase.end > latest) {
            latest = phase.end;
        }
        if (typeof phase.task !== 'undefined') {
            for (var j = 0, countTasks = phase.task.length; j < countTasks; j++) {
                task = phase.task[j];
                if (task.start < earliest) {
                    earliest = task.start;
                }
                if (task.end > latest) {
                    latest = task.end;
                }
            }
        }
    }
    return { earliest: earliest, latest: latest };
}