功能
可实现自动更新最新的在最上面
支持增加，查询。
支持多表构建，比如同时需要收藏，和观看历史
复制到你的工程里面去。比如改名为maputil.js
用法
const mMaputil = require("../../utils/maputil.js");
mEngine = mMaputil.HistoryEngine();//每次创建/ 在城阳
mEngine.edit(function () {
}, function () {
//应该是没有进行初始化
console.debug("edit模式进入失败");
}, function () {
util.hideLoading();
});
var currentItems = mEngine.query();
更多用法我最下面有一个历史记录的js源码
/**
* /持久化工具类 排序 永久 保存 取出
/**
* 返回array 查询失败返回[]
*/
/**
判断是否定义 是否有传递参数
@data 需要进行判断的变量 或者方法
**/
function isUndefined(data) {
return data == false || (typeof data) == "undefined";
}
/**
* @param jsonKey 唯一key
*/
function MapUtil(pKey, jsonKey, pTag) {
var jsonKey=jsonKey;
var tag = "[default_Map]";
var map = {};//如果初始化是数组第一次读取是失败的的，那么第一次存入map[xx]显然会出问题，估计之后的不能存放 数字类型自动变成数组然后 如i数字为为 10 1 -9如果没有数据自动填充为null估计都是因为这个初始值导致的的。
var error = "请先对数据进行初始化操作,如先查询(架构设计问题,当时为了快速添加多个模型而做了缓存处理,所以需要调用edit()进行初始化)";
var init = false;
function edit(succ, fail, complete) {
return queryFromStorage(succ, fail, complete);
}
//此操作成功后回个map对象赋值
// queryFromStorage(succ, fail, complete);//初始化查询
if ((typeof jsonKey) == "undefined") {
console.warn(tag + "key没有传递");
jsonKey = "video";//or id
}
function toString() {
// var array = queryData();
// console.debug("history", array);
}
/**
* 不对外暴露 同步请求2017年9月22日 10:11:53 改良
*/
function queryFromStorage(succ, fail, complete) {
try {
map= wx.getStorageSync(pKey);
console.debug(tag + "数据存储查询成功", map, "查询的键" + pKey);
if (isUndefined(map)) {
map = {};
}
if (!isUndefined(succ)) {
console.debug(tag + "数据存储查询成功,进行回调通知", map);
succ(map);
}
}catch(e){
console.warn(e, tag + "无法读取Key:" + pKey+",",e);
if (!isUndefined(fail)) {
fail(e);
}
}
init = true;
if (!isUndefined(complete)) {
complete();
}
return map;
}
/**
* 不对外暴露 同步存储
*/
function saveDataToStorage(map, succ, fail, complete) {
if (!init) {
console.warn(tag+" 没有使用edit()方法进行初始化，saveDataToStorage fail");
if (!isUndefined(fail)) {
var res = { errMsg: "请先调用本对象的edit(succCall,failCall,completeCall);" };
fail(res);
}
if (!isUndefined(complete)) {
complete();
}
return;
}
try{
wx.setStorageSync(pKey,map);
console.debug(tag + "存储数据到持久化成功", "table", pKey, map);
if (!isUndefined(succ)) {
succ();
}
}catch(e){
console.warn(tag + "无法存储数据", e, "需要存储的数据为为：", map);
if (!isUndefined(fail)) {
fail(e);
}
}
if(!isUndefined(complete)){
complete();
}
return map;
}
function putData(model) {
var id = model[jsonKey];
if (isUndefined(id)) {
console.debug(tag, model, "传递的json对象没有包含键名: " + jsonKey);
} else {
var data = map[id];
if (isUndefined(data)) {
console.debug(tag + "new insert Data : model[", model, "]id is ", id);
} else {
console.debug(tag + "replace Data : model[", data, "]->To->", map[id], "id is" + id);
}
}
map[id] = model;
return true;
}
function dataExist(model) {
var id = model[jsonKey];
var result = !isUndefined(map[id]);
console.debug(tag + "model." + jsonKey + "=", id, "dataExist:" + result + "," + map[id]);
return result;
}
/**
* 成功返回模型 失败返回null
*/
function queryByKey(key) {
if (isUndefined(key)) {
console.error(tag + "queryByKey(key) key is undefined");
return;
}
// var id = model[jsonKey];//也可以理解为为 址model.jsonkey 这里唯一字段为视频id 然后再从从 map缓存中取
var temp = map[key];
console.debug(tag + "queryByKey->查询key==Undefined->" + isUndefined(key) + ",key=" + isUndefined(key) == false ? key : " error", "查询结果:", temp);
return temp;
}
/**
* @fail 失败的回调 不会保存
*/
function deleteData(model, fail) {
//检查当前模型是否有此key, 需要这个key来获取
var id = model[jsonKey];//从模型中取出键名ID
if (isUndefined(id)) {
if (!isUndefined(fail)) {
var err = { errMsg: "deleteData fail: not container key " + jsonKey + "" };
fail(err);
}
console.error(tag + "deleteData fail: not container key " + jsonKey + "", model[jsonKey], id);
return false;
}
//通过模型的id值 检查整个map中是否有此模型
if (isUndefined(map[id])) {
if (!isUndefined(fail)) {
var err = { errMsg: "deleteData fail: not exist:[" + jsonKey + "]", };
fail(err);
}
console.warn(tag + "deleteData fail: not exist:[" + jsonKey + "]");
return false;
}
// map[id] = null;
var result = delete map[id];
console.debug(tag + "删除结果" + result);
return result;
}
/**
* 不对外暴露
*/
function queryToArray() {
var map = queryFromStorage();
console.debug("queryToArray",map);
var array = [];
for (var key in map) {
array.push(map[key]);
console.debug(tag + "mapToArray: ", map[key]);
}
return array;
}
/**
* 返回出 时间排序的json对象 在执行完毕后才能进行操作 非耗时操作，但是本功能必须在在 初始化对象完成后调用
*/
function queryData() {
return queryToArray();
}
function submit(succ, fail, complete) {
saveDataToStorage(map, succ, fail, complete);
}
function isInit() {
return init;
}
function setTag(pTag) {
tag = "[" + pTag + "]";
}
function getTag() {
return tag;
}
// this.saveDataToStorage = saveDataToStorage;
this.submit = submit; //添加修改后都需要保存才行
this.putData = putData;
this.deleteData = deleteData;
this.dataExist = dataExist;
this.queryData = queryData;
this.edit = edit;
this.isInit = isInit;
this.queryByKey = queryByKey;
this.setTag = setTag;
this.getTag = getTag;
if (!isUndefined(pTag)) {
setTag(pTag);
}
console.debug(getTag() + "创建了一个map对象", this);
return this;
}
/**
* 虽然比较奇葩的写法，但是没有办法 比较这耗时操作啊啊，查询会导致按钮。
*/
function LikeEngine() {
console.debug("创建了一个LikeEngine对象");
var maputil = new MapUtil("collect_table", field, "喜欢表");
function removeMulti(array, succ, fail, complete) {
removeMultiData(maputil, array, succ, fail, complete);
}
function add(model, succ, fail, complete) {
addData(maputil, model, succ, fail, complete);
}
function remove(model, succ, fail, complete) {
removeData(maputil, model, succ, fail, complete);
}
function update(model, succ, fail, complete) {
updateData(maputil, model, succ, fail, complete);
}
function query(succ, fail, complete) {
return maputil.queryData(succ, fail, complete);
}
function queryByKey(keyValue) {
return maputil.queryByKey(keyValue);
}
//enter edit mode
function edit(succ, fail, complete) {
return maputil.edit(succ, fail, complete);
}
function isLike(model) {
return maputil.dataExist(model);
}
function isInit() {
return maputil.isInit();
}
this.edit = edit;
this.isLike = isLike;
this.query = query;
this.add = add;
this.remove = remove;
this.removeMulti = removeMulti;
this.isInit = isInit;
this.queryByKey = queryByKey;
return this;
}
function HistoryEngine(uniqueKey) {
var field = isUndefined(uniqueKey)? "id":uniqueKey;
console.debug("创建了一个HistoryEngine对象");
var maputil = new MapUtil("brower_history_table", field, "历史记录表");
function isInit() {
return maputil.isInit();
}
function removeMulti(array, succ, fail, complete) {
removeMultiData(maputil, array, succ, fail, complete);
}
function add(model, succ, fail, complete) {
addData(maputil, model, succ, fail, complete);
}
function remove(model, succ, fail, complete) {
removeData(maputil, model, succ, fail, complete);
}
function update(model, succ, fail, complete) {
updateData(maputil, model, succ, fail, complete);
}
function query(succ, fail, complete) {
return maputil.queryData(succ, fail, complete);
}
//enter edit mode
function edit(succ, fail, complete) {
return maputil.edit(succ, fail, complete);
}
/**
* 视频地址 当前封装的是视频地址的值
*/
function queryByKey(keyValue) {
return maputil.queryByKey(keyValue);
}
function isInit() {
return maputil.isInit();
}
this.isInit = isInit;
this.edit = edit;
this.query = query;
this.add = add;
this.remove = remove;
this.update = update;
this.removeMulti = removeMulti;
this.queryByKey = queryByKey;
return this;
}
/**
* 下面方法 做了complete操作 马上生效
*/
function removeMultiData(engine, array, succ, fail, complete) {
// var failCount = 0;失败就是不！
for (var index = 0; index < array.length; index++) {
var model = array[index];
var result = engine.deleteData(model);//失败了会回调
}
engine.submit(function () {
if (!isUndefined(succ)) {
succ();
}
}, fail, complete);
}
function removeData(engine, model, succ, fail, complete) {
var result = engine.deleteData(model, fail);
if (result) {
engine.submit(succ, fail, complete);
} else {
if (!isUndefined(complete)) {
complete();
}
}
}
function addData(engine, model, succ, fail, complete) {
var result = engine.putData(model);
if (result) {
engine.submit(succ, fail, complete);
} else {
if (!isUndefined(fail)) {
var res = {};
res.errMsg = "找不到model对应的唯一key,";
res.model = model;
fail(res);
}
if (!isUndefined(complete)) {
complete();
}
}
}
/**
* updatetime进行排序
*/
function updateData(engine, model, succ, fail, complete) {
var result = false;
if (engine.dataExist(model)) {
console.warn(engine.getTag() + "updateData check msg:update exist :", model);
}
model.updatetime = new Date().getTime();
result = engine.putData(model);
if (result) {//基本上不可能失败 key
engine.submit(succ, fail, complete);
} else {
console.error(engine.getTag() + " 提交更新失败");
}
return result;
}
module.exports.MapUtil = MapUtil;
module.exports.LikeEngine = LikeEngine;
module.exports.HistoryEngine = HistoryEngine;
播放历史的实现代码
Page({
data: {
edit: false,
items: [],
checkCount: 0
},
onLoad: function (options) {
// 页面初始化 options为页面跳转所带来的参数
mEngine = mMaputil.HistoryEngine();//每次创建/ 在城阳
this.queryData();
},
queryData: function () {
var that = this;
util.showLoading();
mEngine.edit(function () {
}, function () {
//应该是没有进行初始化
console.debug("edit模式进入失败");
}, function () {
util.hideLoading();
});
var currentItems = mEngine.query();
for(var i=0;i取消
// 全选
// 删除
//
//
// 编辑
})