如何在自定义顺序中对JavaScript中的数组进行排序？ [英] How to sort an array in JavaScript in a customized order?

问题描述

可能重复：

如何对javascript对象数组进行排序？

嗯，更精确，我有以下课程：

Well, more preciselly, I have the following class:

function Location(name, latitude, longitude){
this.latitude = latitude;
this.longitude = longitude;
this.name = name;
}

我想按照靠近的顺序对这些对象的数组进行排序给定的位置（像这样的类的对象）。

And I want to sort an array of these objects, by order of proximity to a given Location (an object of a class like this one).

推荐答案

你需要一个比较器函数：

You'll need a comparator function:

function sortLocations(locations, lat, lng) {
  function dist(l) {
    return (l.latitude - lat) * (l.latitude - lat) +
      (l.longitude - lng) * (l.longitude - lng);
  }

  locations.sort(function(l1, l2) {
    return dist(l1) - dist(l2);
  });
}

我不打扰那里的平方根因为我不认为这是必要的。此外，我不会考虑球面几何形状的任何奇怪，因为我不认为它的复杂性是值得的。但是，如果您有自己现有的计算距离的方法，可以插入而不是我上面输入的内容。

I don't bother with the square roots there because I don't think it's necessary. Also I'm not accounting for any weirdness from spherical geometry, because again I don't think it's worth the complexity. However, if you have your own existing way to compute a distance, it could be plugged in instead of what I typed above.

你只需要通过你的方式来调用它数组，加上参考点坐标，到该函数。如果您想要传递位置实例，则应该清楚要更改的内容。

You'd call that by just passing your array, plus the reference point coordinates, to that function. If you wanted to pass a "Location" instance instead it should be clear what to change.

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