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webStorage.html
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<!DOCTYPE html>
<html>
<head>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-COMPATIBLE" content="IE=edge,chrome=1"/>
<meta http-equiv="content-type" content="charset=utf-8">
<!-- meta 详细信息 http://www.wzsky.net/html/Website/htmlcss/116165.html -->
<!-- 设置所有缓存无效 -->
<meta http-equiv="Expires" CONTENT="0">
<meta http-equiv="Cache-Control" CONTENT="no-cache">
<meta http-equiv="Pragma" CONTENT="no-cache">
<title>
浏览器缓存理解
</title>
<!--[if lt IE 8]>
<script type="text/javascript" src="lib/json2.js"></script>
<![endif]-->
<link rel="icon" href="favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
</head>
<body>
<h3>浏览器缓存理解</h3>
<p>
1.localStorage 不清除缓存一直存在；
<input type="button" value="点击存入缓存" id="lSetBtn"/>
<input type="button" value="点击删除缓存" id="lRemoveBtn" />
<input type="button" value="点击查看缓存" id="lShowBtn" />
</p>
<p>
<span id="lBtnTips"></span>
</p>
<br/>
<p>
2.sessionStorage：重启浏览器后消失；
<input type="button" value="点击存入缓存" id="sSetBtn"/>
<input type="button" value="点击删除缓存" id="sRemoveBtn" />
<input type="button" value="点击查看缓存" id="sShowBtn" />
</p>
<p>
<span id="sBtnTips"></span>
</p>
<br/>
<p>
3.cookie：需在虚拟服务器运行，放在虚拟服务器（如：tomcat）根目录下（或配置虚拟服务器映射）；
<input type="button" value="点击存入缓存" id="cSetBtn"/>
<input type="button" value="点击删除缓存" id="cRemoveBtn" />
<input type="button" value="点击查看缓存" id="cShowBtn" />
</p>
<p>
<span id="cBtnTips"></span>
</p>
<br />
<p>
4.websql浏览器缓存：仅chrome safari opera浏览器支持；
<input type="button" value="点击存入缓存" id="wSetBtn"/>
<input type="button" value="点击删除缓存" id="wRemoveBtn" />
<input type="button" value="点击查看缓存" id="wShowBtn" />
</p>
<p>
<span id="wBtnTips"></span>
</p>
<br/>
<p>
5.indexDb浏览器缓存：chrome firefox opera浏览器支持、IE(EDGE)、safari部分支持；
<input type="button" value="点击存入缓存" id="iSetBtn"/>
<input type="button" value="点击删除缓存" id="iRemoveBtn" />
<input type="button" value="点击查看缓存" id="iShowBtn" />
</p>
<p>
<span id="iBtnTips"></span>
</p>
<!-- 引入公用自定义文件，其包含cookie封装对象 后续去除 -->
<script type="text/javascript" src="utils/cookieUtil.js"></script>
<script>
// 不是很准确的总结：
// 1.localStorage、sessionStorage 是html5 规范，IE8就支持了，不同浏览器总大小不同，大概为5MB；
// 2.cookie 比较老的缓存实现方式，不同浏览器支持的cookie 个数跟容量不同，容量大概4K;（http://www.cnblogs.com/henryhappier/archive/2011/03/03/1969564.html）
// 3.webSql HTML5新增缓存机制，IE所有版本（包括edge） firefox均不支持， PC端目前基本无法投入使用；http://dev.w3.org/html5/webdatabase/?cm_mc_uid=87151019066814486820761&cm_mc_sid_50200000=1448682076#introduction
// 4.IndexDb HTML5规范的另一缓存机制， 浏览器支持情况比websql好一些； IE10(edge14仍是部分支持)开始部分支持， firefox、chrome、Opera全支持、safari8开始部分支持；实际开发同上，暂时鸡肋；
// http://rainsilence.iteye.com/blog/984569(更详细的资料) (db.setVersion方法已被弃用) http://www.tfan.org/no-setversion-now-onupgradeneeded/
// 全局变量，可以将需要暴露的方法放置其中
var xq = {};
init();
function init() {
initSessionDemo();
initlocalStorageDemo();
initCookieDemo();
initWebSqlDemo();
initIndexDbDemo();
}
// sessionStorage 模块
function initSessionDemo(){
var session_storage, s_set_btn, s_remove_btn, s_show_btn, s_btn_tips;
s_set_btn = document.getElementById('sSetBtn');
s_remove_btn = document.getElementById('sRemoveBtn');
s_show_btn = document.getElementById('sShowBtn');
s_btn_tips = document.getElementById('sBtnTips');
try {
session_storage = window.sessionStorage;
session_storage.getItem('xq');
s_set_btn.onclick = sessionSetItem;
s_show_btn.onclick = showSessionStorage;
s_remove_btn.onclick = sessionRemoveItem;
}catch(e) {
s_set_btn.style.display = 'none';
s_remove_btn.style.display = 'none';
s_show_btn.style.display = 'none';
s_btn_tips.innerHTML = '浏览器不支持sessionStorage';
}
// 插入缓存
function sessionSetItem(event){
// console.log('event: ', event);
// console.log('this: ', this);
// 检测 sessionStorage 能否多窗口(或选项卡)共存
if (window.sessionStorage) {
session_storage.setItem('xq', 'sb');
s_btn_tips.innerHTML = '保存成功！';
}else {
s_btn_tips.innerHTML = '保存失败！';
}
}
// 显示storage, 转成字符串显示，JSON对象赋值之，ie8（不包括IE8）以下浏览器需引入json3
function showSessionStorage(){
if (window.sessionStorage) {
s_btn_tips.innerHTML = 'sessionStorage:' + JSON.stringify(session_storage);
} else {
s_btn_tips.innerHTML = '浏览器不支持sessionStorage';
}
}
// 清除缓存
function sessionRemoveItem(event){
// 检测 sessionStorage 能否多窗口(或选项卡)共存
if (window.sessionStorage) {
session_storage.removeItem('xq');
s_btn_tips.innerHTML = '删除成功！';
}else {
s_btn_tips.innerHTML = '删除失败！';
}
}
}
// localStorage 模块， 2015年11月24日 编码风格较之前有所改变
function initlocalStorageDemo(){
var localStorage, lSetBtn, lRemoveBtn, lShowBtn, lBtnTips;
lSetBtn = document.getElementById('lSetBtn');
lRemoveBtn = document.getElementById('lRemoveBtn');
lShowBtn = document.getElementById('lShowBtn');
lBtnTips = document.getElementById('lBtnTips');
try {
localStorage = window.localStorage;
localStorage.getItem('xq');
lSetBtn.onclick = localSetItem;
lRemoveBtn.onclick = localRemoveItem;
lShowBtn.onclick = showLocalStorage;
}catch(e) {
lSetBtn.style.display = 'none';
lRemoveBtn.style.display = 'none';
lShowBtn.style.display = 'none';
lBtnTips.innerHTML = '浏览器不支持localStorage！';
}
// 插入缓存
function localSetItem(event){
if (window.localStorage) {
localStorage.setItem('xq', 'sb');
lBtnTips.innerHTML = '保存成功！';
}else {
lBtnTips.innerHTML = '保存失败！';
}
}
// 显示storage, 转成字符串显示，JSON对象赋值之，ie8（不包括IE8）以下浏览器需引入json3
function showLocalStorage(){
if (window.localStorage) {
lBtnTips.innerHTML = 'localStorage:' + JSON.stringify(localStorage);
} else {
lBtnTips.innerHTML = '浏览器不支持localStorage';
}
}
// 清除缓存
function localRemoveItem(event){
if (window.localStorage) {
localStorage.removeItem('xq');
lBtnTips.innerHTML = '删除成功！';
}else {
lBtnTips.innerHTML = '删除失败！';
}
}
}
// 启动cookie 事件
function initCookieDemo(){
var c_set_btn, c_remove_btn, c_show_btn, c_btn_tips;
c_set_btn = document.getElementById('cSetBtn');
c_remove_btn = document.getElementById('cRemoveBtn');
c_show_btn = document.getElementById('cShowBtn');
c_btn_tips = document.getElementById('cBtnTips');
c_set_btn.onclick = cookieSetItem;
c_remove_btn.onclick = cookieRemoveItem;
c_show_btn.onclick = showCookie;
function cookieSetItem(){
var name = 'xq',
value = 'sb',
hours = 24,
expires = new Date(),
_expires;
expires.setTime(expires.getTime() + hours * 3600000);
_expires = (typeof hours) == "string" ? "" : "; expires=" + expires.toUTCString();
document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + _expires;
if (document.cookie != '') {
c_btn_tips.innerHTML = '设置cookie成功！';
}else{
c_btn_tips.innerHTML = '设置cookie失败！';
}
}
function cookieRemoveItem(){
var _value = '',
name = 'xq',
expires = new Date(0);
document.cookie = name + "=" + ";expires=" + expires.toUTCString();
_value = getCookie("xq");
if (_value) {
c_btn_tips.innerHTML = '删除cookie失败！';
} else {
c_btn_tips.innerHTML = '删除cookie成功！';
}
}
function showCookie() {
var _value = '';
_value = getCookie('xq');
c_obj = {
name: "xq",
value: _value
};
c_btn_tips.innerHTML = JSON.stringify(c_obj);
}
function getCookie(name){
var allcookies = document.cookie,
name = 'xq=',
pos = allcookies.indexOf(name),
_value = '';
var start = 0,
end = 0;
if (pos != -1) {
start = pos + name.length;
end = allcookies.indexOf(";", start);
if ( end == -1) {
end = allcookies.length;
}
_value = allcookies.substring(start, end)
}
return _value;
}
}
// web sql 模块(w3c 已表示不再维护，indexDb代替之)
function initWebSqlDemo(){
var wSetBtn, wRemoveBtn, wShowBtn, wBtnTips;
var db;
wSetBtn = document.getElementById('wSetBtn');
wRemoveBtn = document.getElementById('wRemoveBtn');
wShowBtn = document.getElementById('wShowBtn');
wBtnTips = document.getElementById('wBtnTips');
try {
db = openDatabase('mydatabase', '2.0', 'my db', 2 * 1024);
wSetBtn.onclick = webSqlSetItem;
wShowBtn.onclick = showWebSql;
wRemoveBtn.onclick = webSqlRemoveItem;
}catch(e) {
wBtnTips.innerHTML = '浏览器不支持webSql';
wSetBtn.style.display = 'none';
wRemoveBtn.style.display = 'none';
wShowBtn.style.display = 'none';
}
// 插入缓存
function webSqlSetItem(){
db.transaction(function (tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS t1 (id unique, log)');
tx.executeSql('INSERT INTO t1 (id, log) VALUES (1, "xq too sb")');
wBtnTips.innerHTML = 'webSql 插入成功！';
});
}
// 删除缓存
function webSqlRemoveItem(){
db.transaction(function (tx) {
tx.executeSql('DELETE FROM t1 WHERE id = 1');
wBtnTips.innerHTML = 'webSql 删除成功！';
});
}
// 查询缓存(回调函数 方便扩展)
function showWebSql(searchCb) {
db.readTransaction(function (tx) {
tx.executeSql('SELECT * FROM t1', [], function (tx, results) {
var len = results.rows.length, i;
if (searchCb && (typeof searchCb) == 'function') {
searchCb(results);
} else {
msg = "<p>Found rows: " + len + "</p>";
for (i = 0; i < len; i++){
msg += "<p><b>" + results.rows.item(i).log + "</b></p>";
}
wBtnTips.innerHTML = msg;
}
}, null);
});
}
}
// indexDb 模块
function initIndexDbDemo(){
var iSetBtn, iRemoveBtn, iShowBtn, iBtnTips;
iSetBtn = document.getElementById('iSetBtn');
iRemoveBtn = document.getElementById('iRemoveBtn');
iShowBtn = document.getElementById('iShowBtn');
iBtnTips = document.getElementById('iBtnTips');
//数据库名称
var dbName = "H5AppDB",
//数据库版本
dbVersion = 3,
//表名
tablename = "todo",
//indexDb数据库对象
indexDbObj = {},
//实例化IndexDB数据上下文，根据浏览器类型来做选择
indexedDB = null;
try {
indexedDB = window.indexedDB || window.webkitIndexedDB ||window.mozIndexedDB;
if ('webkitIndexedDB' in window) {
window.IDBTransaction = window.IDBTransaction;
window.IDBKeyRange = window.IDBKeyRange;
}
// 打开indexDb数据库
var request = indexedDB.open(dbName, dbVersion);
request.onupgradeneeded = function() {
var store = event.currentTarget.result.createObjectStore(tablename, {keyPath: "indexId"});
}
request.onsuccess = function(e){
var _request;
indexDbObj = request.result;
// 初始化数据库成功！
iSetBtn.onclick = indexDbSetItem;
iShowBtn.onclick = showIndexDb;
iRemoveBtn.onclick = indexDbRemoveItem;
}
request.onfailure = indexError;
}catch(e) {
iBtnTips.innerHTML = '浏览器不支持indexDb';
iSetBtn.style.display = 'none';
iRemoveBtn.style.display = 'none';
iShowBtn.style.display = 'none';
}
// 错误处理
function indexError(){
iBtnTips.innerHTML = "indexDb数据库处理时出现异常！";
}
// 插入缓存
function indexDbSetItem(){
var trans = indexDbObj.transaction([tablename], "readwrite"),
store = trans.objectStore(tablename),
newArray = ["wteamxq","151201"];
//数据以对象形式保存，体现NoSQL类型数据库的灵活性
var data = {
"text": "xq sb",
"indexId": "1",
"obj":newArray
};
var request = store.put(data);//保存数据
request.onsuccess = function (e) {
iBtnTips.innerHTML = "indexDb 插入数据成功！";
};
request.onerror = indexError;
}
// 删除缓存
function indexDbRemoveItem(){
var trans = indexDbObj.transaction([tablename], "readwrite"),
store = trans.objectStore(tablename),
request = store.delete("1");//根据主键来删除
request.onsuccess = function(e) {
iBtnTips.innerHTML = "indexDb 删除数据成功！";
};
request.onerror = indexError;
}
// 查询缓存(回调函数 方便扩展)
function showIndexDb(searchCb) {
//通过事物开启对象
var trans = indexDbObj.transaction([tablename], "readwrite"),
//获取到对象的值
store = trans.objectStore(tablename),
// Get everything in the store;
keyRange = IDBKeyRange.lowerBound(0),
//开启索引为0的表
cursorRequest = null;
iBtnTips.innerHTML = 'indexDb 数据内容为空！';
//开启索引为0的表
cursorRequest = store.openCursor(keyRange);
cursorRequest.onsuccess = function (e) {
var result = e.target.result;
if (!!result == false) {
return false;
}
iBtnTips.innerHTML = JSON.stringify(result.value);
//轮询读取
// result.continue();
};
cursorRequest.onerror = indexError;
}// end of showIndexDb
}
</script>
</body>
</html>