


1.Application Cache
HTML5 introduces application cache, which means that web applications can be cached and can be used even without a network.
The application cache has three characteristics
Offline browsing
Cached resources Faster loading
Reduce server load, the browser will only download updated or changed resources from the server
The method of use is to Add a manifest attribute to the html tag
Each page with a specified manifest will be cached when the user accesses it. If the manifest attribute is not specified, the page will not be cached (unless it is specified directly in the manifest file).
The recommended file extension for manifest files is: ".appcache".
nbsp;HTML> The content of the document......
Manifest files are simple text files that tell the browser what is cached (and what is not cached).
Manifest files can be divided into three sections:
CACHE MANIFEST - Files listed under this heading will be cached after the first download
NETWORK - The files listed under this heading require a connection to the server and will not be cached
- ##FALLBACK - The files listed under this heading require a connection to the page Fallback page when inaccessible (such as 404 page)
CACHE MANIFEST # 2012-02-21 v1.0.0 /theme.css /logo.gif /main.js NETWORK: login.asp FALLBACK: /html5/ /404.html2.localStorage & sessionStorage HTML5 provides two new ways to store data on the client side:
- localStorage - data storage without time limits
- sessionStorage - Data storage for a session
Methods of localStorage and sessionStorage:
Purpose: Store value into the key field
Usage: .setItem(key, value)
Code example:
sessionStorage.setItem("key", "value"); localStorage.setItem("site", "js8.in");getItem gets value
Usage: Get the locally stored value of the specified key
Usage: .getItem(key)
Code example:
var value = sessionStorage.getItem("key"); var site = localStorage.getItem("site");removeItemDelete key
Usage: Delete the specified key Locally stored value
Usage: .removeItem(key)
Code example:
sessionStorage.removeItem("key"); localStorage.removeItem("site");clear clear all key/value
Usage: clear all Key/value
Usage: .clear()
sessionStorage is not a persistent storage and will be cleared after the browser is closed. LocalStorage is used for persistent local storage. Unless the data is actively deleted, the data will never expire.
3.indexDBindexDB is a lightweight NOSQL database. It is more efficient than web sql (sqlite), including indexing, transaction processing and robust query functions. Its features include:- A website may have one or more IndexedDB databases, and each database must have a unique name.
- A database can contain one or more object stores. An object store (uniquely identified by a name) is a collection of records. Each record has a key and a value. The value is an object that can have one or more properties. Keys may be based on a key generator, derived from a key path, or set explicitly. A key generator that automatically generates unique consecutive positive integers. The key path defines the path to the key value. It can be a single JavaScript identifier or multiple identifiers separated by periods. (Somewhat like the characteristics of a column database)
- In IndexedDB, almost all operations use the command->request->result method. For example, query a record, return a request, and get the query result in the result of the request. Another example is opening a database, returning a request, and getting the returned database reference in the result of the request.
- indexedDB needs to be placed on the web server before it can run.
The above is the detailed content of Detailed explanation of several examples of html5 storing data on the client. For more information, please follow other related articles on the PHP Chinese website!

html5的div元素默认一行不可以放两个。div是一个块级元素,一个元素会独占一行,两个div默认无法在同一行显示;但可以通过给div元素添加“display:inline;”样式,将其转为行内元素,就可以实现多个div在同一行显示了。

html5中列表和表格的区别:1、表格主要是用于显示数据的,而列表主要是用于给数据进行布局;2、表格是使用table标签配合tr、td、th等标签进行定义的,列表是利用li标签配合ol、ul等标签进行定义的。

固定方法:1、使用header标签定义文档头部内容,并添加“position:fixed;top:0;”样式让其固定不动;2、使用footer标签定义尾部内容,并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制,它只是一个矩形的图形容器,绘制图形必须通过脚本(通常是JavaScript)来完成;开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有:1、acronym,用于定义首字母缩写,可用abbr替代;2、basefont,可利用css样式替代;3、applet,可用object替代;4、dir,定义目录列表,可用ul替代;5、big,定义大号文本等等。

html5废弃了dir列表标签。dir标签被用来定义目录列表,一般和li标签配合使用,在dir标签对中通过li标签来设置列表项,语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir,可使用ul标签取代。

html5是指超文本标记语言(HTML)的第五次重大修改,即第5代HTML。HTML5是Web中核心语言HTML的规范,用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的,在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成,其在互联网中得到了非常广泛的应用,提供更多增强网络应用的标准机。

3种取消方法:1、给td元素添加“border:none”无边框样式即可,语法“td{border:none}”。2、给td元素添加“border:0”样式,语法“td{border:0;}”,将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式,语法“td{border:transparent;}”,将td边框的颜色设置为透明即可。


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