什么是JavaScript中的[1,2,3,4] [1,2] [英] What is [1,2,3,4][1,2] in javascript

问题描述

任何人都可以通过解释来解释上述问题.我尝试过它的控制台，答案是3

can anyone explains the above question with explanation. I tried it console and the answer coming is 3

[1,2,3,4][1,2] //consoles 3

推荐答案

[1,2,3,4] 是 1,2 是两个数字，其中逗号之间的运算符，因此解析为 2 .

1,2 is two numbers with a comma operator between them, so resolves to 2.

因此，您将从数组中获得索引2(第三项).

So you are getting index 2 (the third item) from the array.

var array = [1,2,3,4];
var property = (1,2);
var result = array[property];

console.log({ array: array, property: property, result: result });

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