資料準備：

var o = {
    //基本資料型別
    name:'hxj',
    //引用資料型別中的Object
    user:{
        age:23,
        id:201
    },
    //引用資料型別中的Array
    friend:['zs','yy','f'],
}

淺拷貝

function  Copy(o,copyO) {
    var copyO = copyO || {};
    for(var i in o){
        copyO[i] = o[i];
    }
    return copyO;
}

 測試：

var copy1 = Copy(o);
copy1.name = 'zs';
copy1.friend.push('pp');
copy1.user[name] = 'user1';
console.log('o:',o);
console.log('copyO:',copy1);

深拷貝

function deepCopy(o,copyO){
    var copyO = copyO || {};
    for(var i in o){
        if(o[i] instanceof Array){
            copyO[i] = [];
            //如果屬性是陣列或物件，則遞迴他的屬性，直到屬性為基本型別
 

            deepCopy(o[i],copyO[i]);
        }else if(o[i] instanceof  Object){
            copyO[i] = {};
            deepCopy(o[i],copyO[i]);
        }else{
            copyO[i] = o[i];
        }
    }
    return copyO;
}

測試：

var copyO2 = deepCopy(o);
copyO2.name = 'hh';
copyO2.friend.push('pp');
console.log('o:',o);
console.log('copyO:',copyO2);