javascript - 在for-of循环中访问ES6数组元素索引(Access to ES6 array element index inside for-of loop)

Question

We can access array elements using a for-of loop:(我们可以使用for-of循环访问数组元素：)

for (const j of [1, 2, 3, 4, 5]) { console.log(j); } How can I modify this code to access the current index too?(如何修改此代码也可以访问当前索引？) I want to achieve this using for-of syntax, neither forEach nor for-in.(我想使用for-of语法来实现此目的，无论是forEach还是for-in。)   ask by Abdennour TOUMI translate from so

Answer 1

Use Array.prototype.keys :(使用Array.prototype.keys ：)

for (const index of [1, 2, 3, 4, 5].keys()) { console.log(index); } If you want to access both the key and the value, you can use Array.prototype.entries() with destructuring :(如果要访问键和值，则可以将Array.prototype.entries()与destructuring一起使用 ：) for (const [index, value] of [1, 2, 3, 4, 5].entries()) { console.log(index, value); }