深拷贝

/**
 * NOTE: 深拷贝
 */

function deepCopy(target) {
  // NOTE: 过滤掉基础类型
  if (typeof target !== 'object') {
    return target
  }
  let n;
  // NOTE: 处理引用类型
  if (Array.isArray(target)) {
    n = new Array(target.length);
    target.forEach((v, i) => (n[i] = deepCopy(v)));
  } else {
    n = {}
    Object.keys(target).forEach(key => {
      n[key] = deepCopy(target[key]);
    });
  }
  return n
}

const a = {
  a: [
    1,
    [4],
    {
      a: {
        c: [4]
      }
    }
  ],
  c: () => {
    console.log(1)
  }
}

const b = deepCopy(a);

a.c = "c";
console.log(a);
console.log(b);
console.log(a.c);
console.log(b.c)