Best way to find if an item is in a JavaScript array? [duplicate]

问题：

This question already has answers here : 这个问题在这里已经有了答案：

How do I check if an array includes a value in JavaScript? 如何检查数组是否包含 JavaScript 中的值？ (55 answers) (55 个回答)

Closed 4 years ago . 4年前关闭。

What is the best way to find if an object is in an array?查找对象是否在数组中的最佳方法是什么？

This is the best way I know:这是我所知道的最好的方法：

function include(arr, obj) { for (var i = 0; i < arr.length; i++) { if (arr[i] == obj) return true; } } console.log(include([1, 2, 3, 4], 3)); // true console.log(include([1, 2, 3, 4], 6)); // undefined

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解决方案：

参考一： https://en.stackoom.com/question/bQ7
参考二： https://stackoom.com/question/bQ7