Javascript中的数字数组排序-逐步

如果我的程序看起来像这样-

const numbers = [5,4,100,2];
numbers.sort((a,b) => {
    console.log(` a = ${a}, b = ${b} and a - b = ${a-b}`);
    return a-b;
});

a = 4, b = 5 and a - b = -1
a = 100, b = 4 and a - b = 96
a = 100, b = 5 and a - b = 95
a = 2, b = 5 and a - b = -3
a = 2, b = 4 and a - b = -2
[2, 4, 5, 100]

然后我的输出如下所示-

const numbers = [5,4,100,2];
numbers.sort((a,b) => {
    console.log(` a = ${a}, b = ${b} and a - b = ${a-b}`);
    return a-b;
});

a = 4, b = 5 and a - b = -1
a = 100, b = 4 and a - b = 96
a = 100, b = 5 and a - b = 95
a = 2, b = 5 and a - b = -3
a = 2, b = 4 and a - b = -2
[2, 4, 5, 100]

你能解释一下这些步骤吗