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This article mainly introduces Node. the event-driven programming in js is explained in detail. This article mainly describes theoretical knowledge, such as what is event-driven programming, What Is closures, and how closures help asynchronous programming, if you need it, you can refer to the traditional programming mo
event queue, and the callback function of the processing result will be left. The event loop thread (which is similar to RunLoop in ios) processes tasks in the event queue, until the callback function no longer exists.
2. Without blocking, a function with callback is put into the
This article mainly introduces how to easily create a node. js server (5): event processing program. This series of articles will create a complete node. js server step by step, if you need it, you can refer to the introduction of an eve
This article mainly introduces Custom Event instances in node. js. A simple example. For more information, see the EventEmitter that inherits events, then you can register the event through the on; emit triggers the event and removeListener removes the
In JavaScript learning, we often encounter JavaScript event mechanisms, such as event binding, event monitoring, event delegation (event broker), and so on. What do these nouns mean, and what is the effect?
In node. js development, the Node Supervisor is used to modify the monitoring file and automatically restart the application.
In the development or debugging of Node. when you modify a js application, you always need to press CTRL
In the front-end development process, we often encounter problems with adding events to page elements, add the event of the JS method is also a lot of directly added to the page structure, there is a use of some JS event monitoring method, due to the different browser
, RemoveListener , Removealllistener , emit and other basic methods of event monitoring mode implementation.It is not the same as the events on the front-end DOM tree, because it does not have event bubbling , layer-wise capture, and other events that belong to the DOM, nor Preventdefault (), Stoppropagation (), Stopimmediatepropagation () Methods for handling
In the front-end development process, we often encounter problems with adding events to page elements, add the event of the JS method is also a lot of directly added to the page structure, there is a use of some JS event monitoring method, due to the different browser
, Removealllistener , emit and other basic methods of event monitoring mode implementation.It is not the same as the events on the front-end DOM tree, because it does not have event bubbling , layer-wise capture, and other events that belong to the DOM, nor Preventdefault (), Stoppropagation (), Stopimmediatepropagation () Methods for handling
Monitoring.Event MonitoringAbout event monitoring, The 3 event stages are defined in the code, which is the capturing phase, the target stage and the bubbling Stage.At first Netscape developed a set of JavaScript Event-driven mechanisms (I.E. event captures). IE also launch
parses JavaScript scripts.(2) The parsed code calls the node API.(3) The LIBUV Library is responsible for the execution of the node API. It assigns different tasks to different threads, forming an event loop (the loop of events) that asynchronously returns the execution res
The biggest feature of zookeeper Node. js is the close integration of asynchronous I/O with events. This mode is very different from the traditional synchronous I/O linear programming approach, because the control flow depends largely on events and callback functions, A logic is split into several cells. Contents: blocking and thread 1. synchronous I/O or blocking I/O threads usually take a long time if the
Document directory
Understanding callback Mode
Understanding event transmitter Mode
Understanding event types
Use the event transmitter API
Create an event Transmitter
For the list of articles in this series and the translation progress, see Node.
that the next code can be executed while the file is being read, greatly improving the performance of the program. As a result, blocking is performed sequentially, not blocking is not required in order, so if you need to handle the parameters of the callback function, you need to write it inside the callback function. *///=========================node.js Events and Event loops/*node.
more difficult,But the good news is that there are many libraries, such as async, that specialize in solving asynchronous programming problems, see Section 6.2.2.Let's look at how to read a file asynchronously in node. js, here's an example:Readfile.jsvar fs = require (' FS ');Fs.readfile (' file.txt ', ' utf-8 ', function (err, data) {if (err) {Console.error (ERR);} else {Console.log (data);}});Console.lo
emitter.addListener("hello",function(){ console.log("Hello");});//使用emit函数发射事件emitter.emit("hello");Registering an event listener with parametersThe registered listener can take the parameters directly and add the corresponding parameters when the emit launch event. Example://事件发射器类声明var EventEmitter = require("events").EventEmitter;//创建事件发射器varnew EventEmitter();//使用on添加监听器emitter.on("hello",function(n
Appbox in Main.aspx.csif (menu. Istreeleaf){Node. Leaf = true;}Else{Node. Singleclickexpand = true;}---if node. Singleclickexpand = True when the current node node has a linked page, the linked page opens in a new window when clicked.?---I want to open the linked page as a t
return results is put into the execution callback function of the code, thus improving the efficiency of the function execution.When an I/O execution is complete, the thread that performs the I/O operation is notified as an event, and the thread executes the callback function for the event, in order to handle the asynchronous I/O, the thread must have an event
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