如何在 for of 循环中访问 i 的当前数量? [英] How can the current number of i be accessed in a for of loop?

问题描述

给定一个 for of 循环，分配的变量的值(在这个例子中为 i)等于 array[i] 如果它是一个正常的for 循环.如何访问 i 当前所在的数组的索引.

Given a for of loop the value of the assigned the variable(i for this example) is equal to what array[i] would equal if it was a normal for loop. How can the index of the array the that i is currently on be accessed.

我想要什么

let array = ["one", "two", "three"];

for (let i of array) {
  console.log(i);// normally logs cycle one : "one", cycle two : "two", cycle three : "three".
  console.log(/*what equals the current index*/);// what I want to log cycle one : 1, cycle two : 2, cycle three : 3. 
}

推荐答案

没有什么简单的...如果你想简单地访问"数组循环中的项和索引，请使用 forEach 例如

nothing simple ... if you want "simple access" to both the item and the index in a loop over an array, use forEach e.g.

array.forEach(function(item, index) { 
... 
});

或作为 T.J.Crowder 指针出问题(我错过了 ES6 标签)

or as T.J. Crowder pointer out (and I missed the ES6 tag)

array.forEach((item, index) => { 
    ... 
});

像许多编程语言一样，javascript 有多种方法可以做类似的事情，技巧在于为工作选择合适的工具

like many programming languages, javascript has multiple ways to do similar things, the skill is in choosing the right tool for the job

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