Update array.md 应该是 arr1[2][0] 而不是 arr1[1][0]。 #445
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const arr1 = ['a', 'b', [1, 2]];
const arr2 = ['c'];
const arr3 = [...arr1, ...arr2];
arr1[2][0] = 9999; // 修改 arr1 中的数组成员值
console.log(arr3); // 输出 ['a', 'b', [9999, 2], 'c']