最近，当我正与JavaScript的排序（）函数，我发现的教程 1这个功能确实的数字不正确排序。代替进行排序的数字，一个功能必须指出，比较数字，像下面code： -

Recently when I was working with JavaScript "sort()" function, I found in one of the tutorials that this function does not sort the numbers properly. Instead to sort numbers, a function must be added that compares numbers, like the following code:-

<script type="text/javascript">
function sortNumber(a,b)
{
    return a - b;
}

var n = ["10", "5", "40", "25", "100", "1"];
document.write(n.sort(sortNumber));
</script>

输出则当属： -

The output then comes as:-

1,5,10,25,40,100

现在我不明白的是，为什么会发生这种情况与放大器;有谁能够告诉的细节是什么类型的算法在这个的sort（）功能正在使用？这是因为，任何其他语言，我没有发现这个问题，即功能没有的正确的的数字进行排序。

Now what I didn't understand is that why is this occurring & can anybody please tell in details as to what type of algorithm is being used in this "sort()" function? This is because for any other language, I didn't find this problem where the function didn't sort the numbers correctly.

任何帮助是极大的AP preciated。

Any help is greatly appreciated.

推荐答案

那么，如果要排序下面的列表，它仅包含字符串：

Well, if you are sorting the following list, it contains only strings:

var n = ["10", "5", "40", "25", "100", "1"];

所以，我希望的任意的语言会比较它们作为字符串，从而导致的排序顺序：

So I would expect any language would compare them as strings, thus resulting in a sort order of:

var n = ["1", "10", "100", "25", "40", "5"];

这需要你的code使用自定义排序（如您已完成）投字符串返回整数进行排序的目的。

Which necessitates your code to use a custom sort (as you have done) to cast the strings back to integers for the purposes of sorting.

修改

由于尖提到的，默认情况下， JavaScript的sort（）方法按字母顺序排序的元素，包括数字：

As Pointy mentioned, by default the JavaScript sort() method sorts elements alphabetically, including numbers:

默认情况下，sort（）方法按字母顺序排序的元素和上升。然而，数字不会正确地排序（40到达前5）。要排序数字，必须添加的比较数字功能。

By default, the sort() method sorts the elements alphabetically and ascending. However, numbers will not be sorted correctly (40 comes before 5). To sort numbers, you must add a function that compare numbers.

简直太神奇了......所以自定义排序是整数数组甚至是必需的。

Simply amazing... so a custom sort is required even for an array of integers.