Contrary to popular belief, ajax technology was not born yesterday. Yes, ajax development, as the honor of web-programming appeared relatively recently. But, firstly, too relatively, and secondly, the very idea of this technology is not just many years, but its use in practice can be counted for decades.<\/p>\n\n\n\n
It will not seem so strange, if you consider that the principle of ajax, it is asynchronous data processing. And this method of working with information is known to any, more or less serious developer of desktop Windows applications, where asynchrony is based on callback functions. In fact, it is these functions that are mostly used by about ninety percent of Windows applications, and Windows itself.
But how are the ajax callback functions related, what is this asynchronicity anyway? It’s really quite simple. Any program is an interaction between the computer and the user. This interaction can be synchronous or asynchronous.<\/p>\n\n\n\n
To visualize how they differ, imagine one person giving two tasks to another.<\/p>\n\n\n\n
In the first, the action is comparable to a synchronous function, because in order to describe the plot, you must first watch the movie all the way through.
The second order is more like an asynchronous function. You don’t have to wait for the call all the time, you just have to react to it properly, if it happens.<\/p>\n\n\n\n