function deepClone(obj){
    let objClone = Array.isArray(obj)?[]:{};
    if(obj && typeof obj==="object"){
        for(var key in obj){
            if(obj.hasOwnProperty(key)){
                //判斷ojb子元素是否為物件，如果是，遞迴複製
                if(obj[key]&&typeof obj[key] ==="object"){
                    objClone[key] = deepClone(obj[key]);
                }else{
                    //如果不是，簡單複製
                    objClone[key] = obj[key];
                }
            }
        }
    }
    return objClone;
}    
let a=[0,0,0,0]
let b=deepClone(a)
a[0]=1;
console.log(a,b);//[1, 0, 0, 0]  [0, 0, 0, 0]