SOURCE

//浅拷贝
var shallowCopy = function (obj) {
    if (typeof obj !== 'object') {
        return;
    }
    var newObj = obj instanceof Array ? [] : {};
    for (var key in obj) {
        if (obj.hasOwnProperty(key)) {
            newObj[key] = obj[key];
        }
    }
    return newObj;
}

//深拷贝
var deepCopy = function (obj) {
    //参数的判定
    if (typeof obj !== 'object') {
        return;
    }
    //对象类型的判别，属于array还是object，创建一个空值
    var newObj = obj instanceof Array ? [] : {};
    for (var key in obj) {//遍历包括原型链上的所有枚举属性
        //判定是否自身属性
        if (obj.hasOwnProperty(key)) {
            newObj[key] = typeof obj[key] === "object" ? deepCopy(obj[key]) : obj[key];
        }
    }
    return newObj;
}

//测试
var sourceObj = {
    flfp: "flfp",
    flsp: {
        slfp: {
            tlfp: {
                flfp: "flfp",
            },
            tlsp: [1, 2, 3, 4, 5, [6, 7, 8]],
        },
        slsp: "slsp",
    }
}
console.log("sourceObj", sourceObj);
//浅拷贝
var shallowCopyObj = shallowCopy(sourceObj);
shallowCopyObj.flsp.slfp.tlsp[5].push(9);
console.log("shallowcopy shallowCopyObj", sourceObj.flsp.slfp.tlsp.toString());
sourceObj.flsp.slfp.tlsp[5].pop();
console.log("sourceObj", sourceObj.flsp.slfp.tlsp.toString());
//深拷贝
var deepCopyObj = deepCopy(sourceObj);
deepCopyObj.flsp.slfp.tlsp[5].push(9);
console.log("deepcopy copyObj", deepCopyObj);