Map
Map是一组键值对的结构，具有极快的查找速度。
Map的定义。
//空map设值key-value
var m = new Map();
m.set("XiaoMing",99);
m.set("XiaoHong",66);
//构造参数传key-value
var m = new Map([['XiaoMing', 99], ['XiaoHong', 66]]);
Map中的方法
var m = new Map(); // 空Map
m.set('XiaoMing', 99); // 添加新的key-value
m.has('XiaoMing'); // 是否存在key 'XiaoMing': true
m.get('XiaoMing'); // 99
m.delete('XiaoMing'); // 删除key 'XiaoMing'
m.get('XiaoMing'); // undefined
对一个key重复设值，后面的值会将前面的值覆盖。
var m = new Map();
m.set('XiaoMing', 99);
m.set('XiaoMing', 98);
m.get('XiaoMing'); // 98
Set
Set和Map类似，但set之存储key，且key不重复。
Set的创建。
var s1 = new Set(); // 空Set
s1.add(1);
s1.add(2);
s1.add(3);
var s2 = new Set([1, 2, 3]); // 含1, 2, 3
插入重复的值，set会将重复的值进行过滤
var s = new Set([1, 2, 3]);
s.add(3);
>>s; // Set{1,2,3}
s.delete(3);
>>s; // Set([1,2]);
Map及Set的遍历
Array可以采用下标进行循环遍历，Map和Set就无法使用下标。为了统一集合类型，ES6标准引入了iterable类型，Array、Map、Set都属于iterable类型。
具有iterable类型的集合可以通过新的for ... of循环来遍历。
var a = ['A', 'B', 'C'];
var s = new Set(['A', 'B', 'C']);
var m = new Map([[1, 'x'], [2, 'y'], [3, 'z']]);
for (var x of a) { // 遍历Array
alert(x);
}
for (var x of s) { // 遍历Set
alert(x);
}
for (var x of m) { // 遍历Map
alert(x[0] + '=' + x[1]);
}
更好的遍历：forEach
forEach是iterable内置的方法，它接收一个函数，每次迭代就自动回调该函数。
var a = ['A', 'B', 'C'];
a.forEach(function (element, index, array) {
// element: 指向当前元素的值
// index: 指向当前索引
// array: 指向Array对象本身
alert(element);
});
Set与Array类似，但Set没有索引，因此回调函数的前两个参数都是元素本身：
var s = new Set(['A', 'B', 'C']);
s.forEach(function (element, sameElement, set) {
alert(element);
});
Map的回调函数参数依次为value、key和map本身：
var m = new Map([[1, 'x'], [2, 'y'], [3, 'z']]);
m.forEach(function (value, key, map) {
alert(value);
});
==================================================
HTML5 Web 存储
很简单
直接上代码：
import React from 'react';
import DataManagerCommonUtil from "./data.manager.common.util";
export default class LocalStorageCommonUtil {
static instanceThis: LocalStorageCommonUtil;
static instance(): LocalStorageCommonUtil {
if (!LocalStorageCommonUtil.instanceThis) {
LocalStorageCommonUtil.instanceThis = new LocalStorageCommonUtil();
}
return LocalStorageCommonUtil.instanceThis;
}
isMeSupportStorage(): boolean {
if (typeof(Storage) !== "undefined") {
console.log('是的! 支持 localStorage sessionStorage 对象!');
return !!localStorage;
} else {
console.log('抱歉! 不支持 web 存储。');
return false;
}
}
/**
* 保存数据
* @param key
* @param value
*/
setItem(key, value): void {
if (this.isMeSupportStorage() && key && value) {
localStorage.setItem(key, value)
}
}
/**
* 读取数据
* @param key
* @returns {*}
*/
getItem(key): any {
if (this.isMeSupportStorage() && key) {
return localStorage.getItem(key)
} else {
return null;
}
}
/**
* 删除单个数据
* @param key
*/
removeItem(key): void {
if (this.isMeSupportStorage() && key) {
localStorage.removeItem(key)
}
}
/**
* 删除所有数据
*/
clear(): void {
if (this.isMeSupportStorage()) {
localStorage.clear()
}
}
/**
* 得到某个索引的key
* @param index
*/
key(index): any {
if (this.isMeSupportStorage() && index >= 0) {
return localStorage.key(index)
} else {
return null;
}
}
}
import React, {PropTypes} from 'react';
import LocalStorageCommonUtil from "./local.storage.common.util";
export default class DataManagerCommonUtil {
dataWorkSpaces: Map = null;
static instanceThis: DataManagerCommonUtil;
static instance(): DataManagerCommonUtil {
if (!DataManagerCommonUtil.instanceThis) {
DataManagerCommonUtil.instanceThis = new DataManagerCommonUtil();
}
return DataManagerCommonUtil.instanceThis;
}
init(workspaceKey, workspaceValue): DataManagerCommonUtil {
if (!this.dataWorkSpaces) {
this.dataWorkSpaces = new Map();
}
this.dataWorkSpaces.set(workspaceKey, workspaceValue);
return this;
}
check(workspaceKey): boolean {
if (this.dataWorkSpaces) {
return this.dataWorkSpaces.has(workspaceKey);
}
return false;
}
delete(workspaceKey): boolean {
if (this.dataWorkSpaces && this.dataWorkSpaces.has(workspaceKey)) {
return this.dataWorkSpaces.delete(workspaceKey);
}
return false;
}
generRealKey(workspaceKey, key): String {
return workspaceKey + '.' + key;
}
//--------------------------------------------------------------------
/**
* 保存数据
* @param workspaceKey
* @param key
* @param value
*/
setItem(workspaceKey, key, value): void {
if (this.check(workspaceKey)) {
LocalStorageCommonUtil.instance().setItem(this.generRealKey(workspaceKey, key), value);
}
}
/**
* 读取数据
* @param workspaceKey
* @param key
* @returns {*}
*/
getItem(workspaceKey, key): any {
if (this.check(workspaceKey)) {
return LocalStorageCommonUtil.instance().getItem(this.generRealKey(workspaceKey, key));
} else {
return null;
}
}
/**
* 删除单个数据
* @param workspaceKey
* @param key
*/
removeItem(workspaceKey, key): void {
if (this.check(workspaceKey)) {
LocalStorageCommonUtil.instance().removeItem(this.generRealKey(workspaceKey, key));
}
}
/**
* 删除所有数据
* @param workspaceKey
* @param key
*/
clear(workspaceKey, key): void {
if (this.check(workspaceKey)) {
this.delete(workspaceKey);
LocalStorageCommonUtil.instance().removeItem(this.generRealKey(workspaceKey, key));
}
}
/**
* 得到某个索引的key
* @param workspaceKey
* @param index
*/
key(workspaceKey, index): void {
if (this.check(workspaceKey)) {
return LocalStorageCommonUtil.instance().key(index);
} else {
return null;
}
}
}
import React, {PropTypes} from 'react';
import DataManagerCommonUtil from "./data.manager.common.util";
export default class AppManagerCommonUtil {
user = {
workspaceKey: 'com.hack.wang.yi.tao.desgin.web.back.site.user',
workspaceValue: 'data',
};
system = {
workspaceKey: 'com.hack.wang.yi.tao.desgin.web.back.site.system',
workspaceValue: 'data',
};
static instanceThis: AppManagerCommonUtil;
static instance(): AppManagerCommonUtil {
if (!AppManagerCommonUtil.instanceThis) {
AppManagerCommonUtil.instanceThis = new AppManagerCommonUtil();
}
return AppManagerCommonUtil.instanceThis;
}
init(): AppManagerCommonUtil {
DataManagerCommonUtil.instance()
.init(this.user.workspaceKey, this.user.workspaceValue)
.init(this.system.workspaceKey, this.system.workspaceValue);
}
constructor() {
this.init();
}
save(workspaceKey: String, key: String, dataStr: String): void {
DataManagerCommonUtil.instance().setItem(workspaceKey, key, dataStr);
}
remove(workspaceKey: String, key: String): void {
DataManagerCommonUtil.instance().removeItem(workspaceKey, key);
}
load(workspaceKey: String, key: String): void {
return DataManagerCommonUtil.instance().getItem(workspaceKey, key);
}
//-----------------------------------------
saveUser(userData: JSON): void {
if (userData) {
this.save(this.user.workspaceKey, this.user.workspaceValue, JSON.stringify(userData));
}
}
removeUser(): void {
this.remove(this.user.workspaceKey, this.user.workspaceValue);
}
loadUser(): JSON {
let result = this.load(this.user.workspaceKey, this.user.workspaceValue);
if (result) {
return JSON.parse(result);
} else {
return result;
}
}
saveSystem(userData: JSON): void {
if (userData) {
this.save(this.system.workspaceKey, this.system.workspaceValue, JSON.stringify(userData));
}
}
removeSystem(): void {
this.remove(this.system.workspaceKey, this.system.workspaceValue);
}
loadSystem(): JSON {
let result = this.load(this.system.workspaceKey, this.system.workspaceValue);
if (result) {
return JSON.parse(result);
} else {
return result;
}
}
//---------------
isLogin(): boolean {
let result = this.loadUser();
return !!(result && result.sessionId);
}
}
COVER：
http://www.runoob.com/html/html5-webstorage.html
https://www.cnblogs.com/weilan/p/7002088.html
