React Native-如何在地图函数中传递索引 [英] React Native - How to pass index in map function

问题描述

我有一个map函数来重复动态地创建一个组件.假设是这样的:

I have a map function to create a component repetitively and dynamically. Suppose it's like this:

renderBoxes() {
    return Array.map(data => this.myFunction(indexOfThisArray));
} 

如何传递数组的索引?这样，"myFunction"函数就可以在每次调用时获取索引值.

How can I pass the index of the array? So that the 'myFunction' function gets the index value everytime it is called.

推荐答案

Map提供第二个参数作为当前元素的索引，第三个参数作为整个数组本身.

Map provides second argument as the index of the current element and third argument as the whole array itself.

renderBoxes() {
    return Array.map((data, index, array) => this.myFunction(index));
} 

详细了解 Array.prototype.地图

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