三种数据结构

重构完成后做了一下三种数据结构,理解各种存储方式的优缺点.

第一种数据结构

var two_activities = [{
            name: "first activity",
            sign_ups: [],
            bids: []
        }, {
            name: "second activity",
            sign_ups: [
                {
                    name:"仝键",
                    phone:"13600000000"
                },
                {
                    name:"于硕",
                    phone:"15600000000"
                },
                {
                    name:"吴京川",
                    phone:"13800000000"
                }
            ],
            bids: [
                {
                    name:"竞价1",
                    biddings : [
                        {
                            name: "仝键",
                            phone:"13600000000",
                            price: "12"

                        },
                        {
                            name: "于硕",
                            phone:"15600000000",
                            price: "10"
                        }
                    ]
                },
                            ]
        }];

第一种数据把所有的数据存储到一个数组里,结构清晰,取数据也方便,但是取数据的时候需要经过多个for,和if的循环嵌套比较繁琐,如果数据较少的话可以这样存取,数据量大的话不推荐 

2.第二种数据结构(哈希表)

var two_activities = {
            "0":{
                name: "first activity",
                sign_ups:[],
                bids:[],
                biddings:{}
            },
            "1": {
                name: "second activity",
                sign_ups: [
                    {
                        name:"仝键",
                        phone:"13600000000"
                    },
                    {
                        name:"于硕",
                        phone:"15600000000"
                    },
                    {
                        name:"吴京川",
                        phone:"13800000000"
                    }
                ],
                bids:["竞价1","竞价2"],
                biddings:{
                    "竞价1":[
                        {
                            phone:"13600000000",
                            price: "12"

                        },
                        {
                            phone:"15600000000",
                            price: "10"
                        }
                    ],
        }
            }
        };

第二种数据结构采用哈希表的方式存储,所有数据存储在activities中,每个活动都分配一个对应的id.结构清晰,存取也较为方便 举个例子,检查是否报名电话重复

check_bid_phone_repeat = function (sms_json) {
    var activities = JSON.parse(localStorage.getItem("activities"));
    var apply_phone = sms_json.messages[0].phone
    var activity = activities[localStorage.current_activity_id].biddings[localStorage.current_bid]
    return( _.find(activity, function (act) {
        return act.phone == apply_phone
    }))

}

3.第三种数据结构

var bids = [
            {
                name: "竞价1",
                activity_id: "1",
                biddings: []

            }

        ];
activities = [  
    {  
        id: "0",  
        name: "first activity"  
    },  
    {  
        id: "1",  
        name: "second activity"  
    }  
];  
];  
sign_ups = [  
    {  
        name: "仝键",  
        phone: "13600000000",  
        activity_id: "0"  
    },  
    {  
        name: "于硕",  
        phone: "15600000000",  
        activity_id: "0"  
    }  
]

 第三种数据结构每个信息存储成一个数组,存储数据的时候特别方便,结构不是很清晰,取相应数据的时候需要逻辑判断,并且存数据的是个个个表之间要有联系.

三种数据结构各有利弊,就个人而言感觉第二中和第三种比较方便,用第三种的时候逻辑一定要清楚