如何从JavaScript数组中删除空对象

const arr = [{}, {id: 1}, {}, {id: 2}, {}];
const results = arr.filter(element => {
  if (Object.keys(element).length !== 0) {
    return true;
  }
  return false;
});
// 👇️ [{id: 1}, {id: 2}]
console.log(results);

console.log(Object.keys({})); // 👉️ []
console.log(Object.keys({id: 1})); // 👉️ ['id']

console.log(Object.keys(0).length); // 👉️ 0
console.log(Object.keys([]).length); // 👉️ 0

const arr = [{}, {id: 1}, 'a', 0, {}, []];
const results = arr.filter(element => {
  if (
    typeof element === 'object' &&
    !Array.isArray(element) &&
    Object.keys(element).length === 0
  ) {
    return false;
  } else {
    return true;
  }
});
// 👇️ [{id: 1}, 'a', 0, []]
console.log(results);

console.log(typeof []) // 👉️ 'object'

const arr = [1, 2, 3, 4, 5, 6]
// 添加元素到数组末尾
arr.push(7) // arr: [1, 2, 3, 4, 5, 6, 7]
// 取出数组末尾元素并返回
const pop_res = arr.pop() // arr: [1, 2, 3, 4, 5, 6], pop_res: 7

// 将元素添加到数组开头
arr.unshift(0) // arr: [0, 1, 2, 3, 4, 5, 6]
// 取出数组开头元素并返回
const sft_res = arr.shift() // arr: [1, 2, 3, 4, 5, 6], sft_res = 0