This article mainly introduces index arrays, associated arrays, static arrays, and dynamic arrays in JavaScript, this article describes how to classify an array into an index array, an associated array, a static array and a dynamic array
type, you need to use parseInt() orparseFloat() 函数来强制转化类型。Storage interfaceStorage Interface GetItem (), SetItem ()interface Storage { getter any getItem (in domstring key); void SetItem ( in any data);};When calling SetItem (), using an existing key overwrites the contents of the previous value, and using a nonexistent key when calling GetItem () returns NULL.As with other
launched by Microsoft in the browser World War in the S. It stores local data with the behaviour attribute of DHTML, allowing each page to store up to 64 K data, and each site can store up to k Data, the disadvantage of userData is obvious. It is not part of the Web standard, unless your program only needs to support IE, it is basically useless.
3. Flash cookie. Flash cookies are not the same as HTTP cookies. They may be called "Flash
implementation of local thread storage helps you use its APIs. A typical implementation includes the following Arrays:
A global (process-level) array used to store key-value information stored locally by the thread
The pthread_key_t type value returned by pthread_key_create () is only an index of the global array
,tlsgetvalue is to take an index and set a value or value to the corresponding array item.Thread-local storage has different implementations on different platforms, and portability is not very good. Fortunately, to implement thread-local storage is not difficult, the simples
call callback function is used to obtain the query result set;
ErrorHandler: the callback function called when the execution fails;
This article uses HTML5 database support to re-implement Address Book Management in the previous article. The functions to be implemented are as follows:
You can create a contact and save it to the database. The contact fields include name, mobile phone number, company, and creation time;
Lists all currently saved contact information;
You can delete specific contac
JavaScript. The problem with Flash is simple, because it's flash. Google Gears: Gears is an open source browser plugin released by Google in 07, designed to improve the compatibility of major browsers, gears built-in a sqlite-based embedded SQL database, and provided a unified API to access the database, after obtaining user authorization, Each site can store an unlimited amount of data in a SQL database, and the problem with gears is that Google it
HTML5 storage provides a way for websites to store information on your local computer and obtain it as needed. This concept is similar to cookie. The difference is that it is designed for larger storage capacity.
HTML5storage provides a way for websites to store information on your local computer and obtain the informa
HTML5 local storage, html5localstorage
Speaking of local storage, this is a tough task to go To the HTML5 step, as shown in the previous history:
The earliest Cookies are naturally known to all. The problem is that they are too small and approximately 4 kb. IE6 only supports 20 cookies for each domain name, which is
1, Sessionstorage
2, Localstorage
3. Database Storage
4, Globalstorage
5. Compatibility
Reference documents
Local persistent storage has always been an aspect of a local client program over a Web program. For local applications, the operating system
When it comes to local storage, it's a great way to get to the HTML5, and the previous history is probably as shown in the following figure:
The earliest cookies naturally are known to all, the problem is too small, probably 4KB, and IE6 only support 20 cookies per domain, too little. The advantage is that we all support, but also good support. Long ago, those who had disabled cookies were slowly not
,storageinfo.value); //If you want to specify a lifecycle if (config.expires) { var expires; // If the expires in the set item is a number, the number of milliseconds that the data can survive if (' numbers ' = typeof storageinfo.expires) { nbsp; expires = new Date (); Expires.settime (expires.gettime () + storageinfo.expires); } window.localStorage.setItem (Storageinfo.key + ". Expires", expires); }
When data is read, universal reads this field to determine whether the time excee
have been several alternatives to this problem. Various browsers have introduced proprietary storage APIs. Developers also use the extended storage feature in Flash Player (implemented through JavaScript ). Similarly, Google has created the Gears plug-in for various browsers and contains storage APIs. Not surprisingly
Html5webstorage Local StorageWebStorage is used to implement the client storage data, we all know that the previous cookie is a way of client storage, today look at HTML5 new local storage methods: Localstorage and Sessionstorage.localstorage: The stored data will always exi
executing a function, the storage units of local variables within the function can be created on the stack, which are automatically freed when the function is executed at the end. The stack memory allocation operation is built into the processor's instruction set and is highly efficient, but allocates limited memory capacity.int A;5 Static Storage AreaMemory is
Localforage IntroductionProject Address Https://github.com/localForage/localForageAPI Chinese Address https://localforage.docschina.org/Speaking of local storage The first thing we think about is localstorage storage, and many people have used it, but Localstorage has the following drawbacks:
Storage capacity
HTML5 Localstorage Local StorageWhen it comes to local storage, it's been a long walk to HTML5 , and the previous history is probably as follows: The earliest cookie is naturally known to all, the problem is mainly too small, probably also 4KB appearance, and IE6 only support each domain name of the three Cookies, too few. The advantage is that we all support, b
21.1 Dynamic TLS21.1.1 Why use thread-local storageWhen writing a multithreaded program, you want to store some thread-private data, and we know that the data belonging to each thread is private, including the thread's stack and the current register, but both of these are very unreliable, and the stack is changed when each function exits and enters, and the registers are much less pathetic. What if we want to use a global variable in a thread, but wan
PrefaceLocal persistent storage has always been an aspect of a local client program over a Web program. For local applications, the operating system provides an abstraction layer for storing and retrieving application-specific data, such as user settings or run-time state. These values can be stored in the registry, INI file, or somewhere else, depending on the i
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