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执行下面的代码后，arr数组的值为__________。 #274

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pwstrick opened this issue Jul 16, 2019 · 1 comment

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JavaScript

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pwstrick commented Jul 16, 2019

执行下面的代码后，arr数组的值为__________。

var arr = [4, 1, 5, 2, 3];
arr.sort(function(a, b) {
  return a > b;
});

pwstrick added the JavaScript label

anyrealx commented Oct 25, 2024

[4, 1, 5, 2, 3]
因为 sort接受的函数返回值，有效值只能是一个负数、零或正数,。正确标准的写法是 a - b 或者b-a 。a>b 产生一个布尔值，js有隐式转换，true false 转成1 0 那么排序就混乱了， 0代表顺序无关紧要，也就不改变了。

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