如何使用JavaScript按索引删除数组元素？

Question

如何通过其索引删除数组元素？

例如

fruits = ["mango","apple","pine","berry"];

移除 fruits[2] 元素以获得

fruits = ["mango","apple","berry"];

- Hasanuzzaman

Answer 1

你可以使用splice，如下所示：array.splice(起始索引, 要删除的元素数量)。以下是您示例的解决方案：

const fruits = ["mango","apple","pine","berry"]; 
const removed = fruits.splice(2, 1); // Mutates fruits and returns array of removed items
console.log('fruits', fruits); // ["mango","apple","berry"]
console.log('removed', removed); // ["pine"]

这将从索引2处删除一个元素，即在操作fruits=["mango","apple","berry"];之后。

- Jahnavi Paliwal

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不知道为什么在Node.js中的slice(i, j)是从索引i到j-1获取子数组，而不是从索引i开始删除j个项目！ - Nam G VU