如何将某些内容附加到数组中？

let myArray = [1, 2, 3];
myArray.push(4);
console.log(myArray); // 输出 [1, 2, 3, 4]

let myArray = [1, 2, 3];
myArray.unshift(0);
console.log(myArray); // 输出 [0, 1, 2, 3]

let myArray = [1, 2, 4];
myArray.splice(2, 0, 3);
console.log(myArray); // 输出 [1, 2, 3, 4]