第五题，js实现一个克隆函数

let arr = [1,2,3];
function copy(obj){
    let newobj = null;   
    if(typeof(obj) == 'object' && obj !== null){ 
        newobj = obj instanceof Array? [] : {};   
        for(var i in obj){  
            newobj[i] = copy(obj[i])
        }
    }else{
        newobj = obj
    }    
    return newobj;    
}

console.log(copy(arr)) // [1,2,3]

来源：CSDN

作者：最有才的河南大汉

链接：https://blog.csdn.net/Jkssns/article/details/103943389