JavaScript中的push方法详解

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

let array = [1, 2, 3];
array.push(4, 5, 6);
console.log(array); // [1, 2, 3, 4, 5, 6]

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

let array = [];
for (let i = 0; i < 5; i++) {
  array.push(i);
}
console.log(array); // [0, 1, 2, 3, 4]

let array1 = [1, 2, 3];
let array2 = [4, 5, 6];
array1.push(...array2);
console.log(array1); // [1, 2, 3, 4, 5, 6]

let array = [1, 2, 3];
let newArray = array.concat(4);
console.log(array); // [1, 2, 3]
console.log(newArray); // [1, 2, 3, 4]