JavaScript对象浅拷贝和深拷贝

var obj = {

    name:'柏龙',

    age: 30,

    sex: '男',

    hobby: ['writeCode','playGame','readBook'],

    friend: {

        name: 'luobo',

        age: 20

    }

}

function shallowCopy(oldObj) {

    var newObj = {};

    for(var i in oldObj) {

        if(oldObj.hasOwnProperty(i)) {

            newObj[i] = oldObj[i];

        }

    }

    return newObj;

}



var copy1 = shallowCopy(obj);

obj.friend.name = '萝卜';

console.log(obj);

console.log(copy1);

function copy(oldObj){

    var newObj = {};

    for(var key in oldObj){

        if(typeof oldObj[key] === 'string' || typeof oldObj[key] === 'number' || typeof oldObj[key] === 'boolean' || typeof oldObj[key] === 'undefined' || oldObj[key] === null ){

            newObj[key] = oldObj[key];

        }else{

            newObj[key] = copy(oldObj[key]);

        }

    }

    return newObj;

}

var copy2 = copy(obj);

obj.friend.name = '萝卜';

console.log(obj);

console.log(copy2);

function setCopy(oldObj){

    var newObj = JSON.parse(JSON.stringify(oldObj));

    return newObj;

}

var copy3 = setCopy(obj);

copy3.name = 'xiaoqiao';

copy3.age = 22;

copy3.friend.name = '帮主';

obj.name = 'bsfans';

console.log(obj);

console.log(copy3);