javascript - 数值数组排序()

Question

《Learning PHP, MySql and Javascript by. Robin Nixon》这本书的这一部分有错吗？

numbers = [7, 23, 6, 74];

numbers.sort(function(a,b){return a - b});

输出为 6,7,23,74

书上说:

If the anonymous function inside sort() returns a value greater than zero, the sort assumes a comes before b.

If the anonymous function inside sort() return a value less than zero, the sort assumes b comes before a.

The sort runs this function across all the values in the array to determine their order.

这是错的吗？因为....

a 这里是7
b 这里是 23

7 - 23 = -16//一个小于零的数字。书上说 b 应该在 a 之前。

所以最终输出应该是74, 23, 7, 6

Answer 1

看来是错的。来自 MDN :

If compareFunction(a, b) is less than 0, sort a to a lower index than b.

(“较低的索引”在这种情况下意味着 a 在 b 之前)