function deepClone(obj) {
    function isObject(o) {
        return (typeof o === 'object' || typeof o === 'function') && o !== null;
    }

    if (!isObject(obj)) {
        throw new Error('非对象')
    }

    let isArray = Array.isArray(obj)

    let newObj = isArray ? [...obj] : { ...obj }

    Reflect.ownKeys(newObj).forEach(key => {
        newObj[key] = isObject(newObj[key]) ? deepClone(newObj[key]) : newObj[key]
    })

    return newObj
}

function deepClone(obj) {
    if (obj === null) return obj; 
    if (obj instanceof Date) return new Date(obj);
    if (obj instanceof RegExp) return new RegExp(obj);
    if (typeof obj !== "object") return obj;
    let cloneObj = new obj.constructor();
    for (let key in obj) {
      if (obj.hasOwnProperty(key)) {
        // 实现一个递归拷贝
        cloneObj[key] = deepClone(obj[key]);
      }
    }
    return cloneObj;
}