JS基础 - 手写深拷贝

function deepClone(obj){
    //不是引用类型或为null时退出递归
    if(typeof obj !== "object" || obj == null){
        return obj;
    }

    //初始化新变量
    let copy;
    if(obj instanceof Array){
        copy = [];
    }else{
        copy = {};
    }

    //深拷贝每一个元素
    for(let key in obj){
        if(obj.hasOwnProperty(key)){
            copy[key] = deepClone(obj[key]);
        }
    }

    return copy;
}