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This article mainly introduces the relevant knowledge of "what is the event-driven mechanism of javascript". The editor shows you the operation process through an actual case, and the operation method is simple, fast and practical. I hope this article "what is the event-driven mechanism of javascript" can help you solve the problem.

Javascript is event-driven. JavaScript is an object-and event-driven scripting language with secure performance. It uses an event-driven mechanism to respond to user actions. When a user operates on a html element, an event is generated, which drives some functions to handle it.

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

JavaScript is an object-based and event-driven scripting language with security performance.

This article explains the event-driven mechanism of javascript on the browser side and the server side (node.js) respectively, and adds some examples of asynchronous programming to deepen understanding.

Event-driven Mechanism of javascript on the browser side

First of all, javascript runs in a single thread on the browser side, which is determined by the browser to avoid conflicts between multiple threads performing different tasks. In other words, the javascript code we write runs on only one thread, called the main thread (HTML5 provides web worker API that allows the browser to open a thread to run complex and time-consuming javascript tasks, but this thread is still under the control of the main thread). For single threading, if we do some "sleep" operations such as:

Var now = + new Date () while (+ new Date ()

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