Javascript 控制台返回不正确的排序数组

Question

我在 chrome 控制台中输入了以下代码。

var array = [25,7,8,41];
array.sort();

它返回 [25,41,7,8]。怎么回事？

Answer 1

The sort() method sorts the items of an array.

The sort order can be either alphabetic or numeric, and either ascending (up) or descending (down).

By default, the sort() method sorts the values as strings in alphabetical and ascending order.

This works well for strings ("Apple" comes before "Banana"). However, if numbers are sorted as strings, "25" is bigger than "100", because "2" is bigger than "1".

Because of this, the sort() method will produce an incorrect result when sorting numbers.

如果您希望更正此问题，您可以编写一个比较函数作为传递给排序方法的第一个参数。引用文献中列出了一个!

编辑:张贴在这里以备将来使用...

var points = [40, 100, 1, 5, 25, 10];
function myFunction() {
    points.sort(function(a, b){return a-b});
    console.log(points);
}

Reference