在循环中如何访问当前的数量？ [英] How can the current number of i be accessed in a for of loop?

问题描述

给定一个for循环，分配给这个例子的变量（ i ）的值等于 array [i] 如果它是一个正常的循环，将相等。

我想要的是如何 i 的数组索引

  let array = [one，two，three]; 
 
（让我的数组）{
 console.log（i）; //通常记录循环一：一，循环二：二，循环三：三。 
 console.log（/ *什么等于当前索引* /）; //我想要记录的周期1：循环2：2，循环3：3. 
} 
  

解决方案

没有什么简单的...如果你想简单访问 item和索引在一个数组中的循环中，使用 forEach eg

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

或作为T.J. Crowd指针（我错过了ES6标签）

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

像许多编程语言一样，javascript有多种方式来做类似的事情，技巧在于选择正确的工作工具

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.

What I want

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. 
}

解决方案

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) { 
... 
});

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

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

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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