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使用下标 ​

js
let arr = [1, 2, 3, 4, 5, 6, 7, 8];
console.log(arr);
console.log(arr[0] = 'hello');
console.log(arr);
let arr = [1, 2, 3, 4, 5, 6, 7, 8];
console.log(arr);
console.log(arr[0] = 'hello');
console.log(arr);

替换指定下标元素/指定下标元素重新赋值 ​

js
/* 使用splice()方法会影响原数组 */
let arr = [1, 2, 3, 4, 5, 6, 7, 8];
console.log(arr);
console.log(arr.splice(2, 1, "hello"));
console.log(arr);
/* 使用splice()方法会影响原数组 */
let arr = [1, 2, 3, 4, 5, 6, 7, 8];
console.log(arr);
console.log(arr.splice(2, 1, "hello"));
console.log(arr);

按照多个下标一次替换多个指定数组元素 ​

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