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javascript - 按字符串日期值对数组列表进行排序

问题描述

data = [["Apples", 606.8, "pos151.5", "12-11-19"],
["Apples", 608.8, "pos213.9", "12-11-19"],
["Apples", 610.5, "pos271.6", "12-11-19"],
["Apples", 612.5, "pos325", "12-11-19"],
["Apples", 609.4, "pos521.7", "12-11-19"],
["Apples", 611.1, "pos622.8", "12-11-19"],
["Bananas", 626.1, "pos175", "02-20-20"],
["Bananas", 626.1, "pos234.2", "02-20-20"],
["Bananas", 630, "pos321", "02-20-20"],
["Bananas", 620.6, "pos97", "02-20-20"],
["Pears", 616.5, "pos150.9", "10-17-19"],
["Pears", 616.6, "pos17.2", "10-17-19"],
["Pears", 615.4, "pos300.9", "10-17-19"],
["Pears", 614, "pos446.9", "10-17-19"],
["Oranges", 616.1, "pos127.69", "10-21-19"],
["Oranges", 616.1, "pos177.49", "10-21-19"],
["Oranges", 616.1, "pos233.69", "10-21-19"],
["Oranges", 616.5, "pos383.73", "10-21-19"],
["Oranges", 616.3, "pos546.93", "10-21-19"],
["Oranges", 615.2, "pos637.99", "10-21-19"]]

如何按每个数组中的第 4 个值（日期字符串）按日期升序对这个数组列表进行排序？

我假设它是这样的，但我不确定如何在没有字段名称/键的情况下调用数组中的第 4 个值：

data.sort(function(a,b) {
    return new Date(a.date).getTime() - new Date(b.date).getTime()
});

谢谢。

标签： javascript

解决方案

当没有为数组设置键时，只需通过基于零的数字索引来访问它们。因此，要访问第 4 项，您将使用data[3]. 因此，鉴于您的排序示例，

data.sort(function(a,b) {
    return new Date(a[3]).getTime() - new Date(b[3]).getTime()
});

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