Javascript：array.indexOf（）没有返回正确的元素索引[重复]

Question

数组：

values: [5,4,4,5,6,6]

我想获取元素的索引。所以，我正在循环播放它。

values.map((val) => {
        console.log('val', value.indexOf(val));
        console.log('val of 5', value.indexOf(5));
        console.log('val of 4', value.indexOf(4));
        console.log('val of 4', value.indexOf(4));
        console.log('val of 5', value.indexOf(5));
        console.log('val of 6', value.indexOf(6));
        console.log('val of 6', value.indexOf(6));
        return value.indexOf(val);
      });

expected output0,1,2,3,4

电流输出

0
1
1
0
4
4 

我哪里出错了？

Answer 1

const values = [5,4,4,5,6,6]
const indexes = values.map((val, idx) => {
        console.log(`Index of ${val} is ${idx}`);
        return idx;
});