javascript - Confused about syntax when using for loop to add to array

Question

I recently came across the following piece of sample code:

function range(upto) {
  var result = [];
  for (var i = 0; i <= upto; i++) {
    result[i] = i;
  }
  return result;
}

and I'm confused as to why:

result[i] = i;

as opposed to:

i = result[i];

Isn't 'i' the variable and 'result[i]' the value?

Answer 1

这填充了数组：

result[0] = 0 // sets the first cell of the array to the value 0
result[1] = 1
etc.

这个函数返回

[0, 1, 2, ... upto]

更多关于 JavaScript 中的数组

Answer 2

这

result[i] = i;

将 的值赋给 的i第i- 个元素result。

因此，result[0]变成0，result[1]变成1等等。

Answer 3

• result[i] = i;表示您正在将值分配给数组i的索引。iresult

• i = result[i];表示您正在将i-th数组索引的值分配给result变量i。

而已。