learn react js

This article mainly share with you to learn more about JS function, hope to help everyone better use JS function. One, Custom function 1. Pass the Function keyword function name ([parameter]) { Code snippet; return value; } Note: The function name does not contain special characters; Function names are best defined; Function names are best followed by hump markin

Have to say, in the JS aspect, oneself really is a genuine rookie. For JS and some JS framework such as jquery JS frame, oneself is just in the stage of simple application, of course, oneself also in continuous learning, hope in the future can share with you more JS experien

headerRes.writehead ($, {"Content-type": Fungetcontenttype (FilePath)});7980//Create read-only stream for returnBayi var stream = Libfs.createreadstream (FilePath, {flags: "R", Encoding:null});8283//Specify 404 error if stream read errorStream.on ("Error", function () {Res.writehead (404);Res.end ("87});8889//Connect file stream and HTTP return stream for the pipeline to return the actual web contentStream.pipe (RES);91}A. else {//file does not exist9394//Return 404 errorRes.writehead (404, {"C

; functioncalculate () {vara=document.getElementById ("Pre-tax"). Value; if(parseint (a)>8000) {document.getElementById ("Interest"). Value= -+(A- 8000)* the/; } Else{document.getElementById ("Interest"). Value=a/Ten; } } //registering key events for the KeyListener methodDocument.onkeydown=KeyListener; functionKeyListener (e) {//when you press ENTER, execute our code if(E.keycode== -) {calculate (

by one. Applyif (O, C) extends non-undefined members in Object C to O. Addbehaviors (o) ID () to generate a unique object ID, ExtendExtended functions, that is, type inheritance. This is a crucial member, and the type derivation in the entire framework is inseparable from its support. The $ of getdom and prototype is the same. Type Removenode Destroy Num Callback Combine Each Urldecode Urlencode JS b

If you have the basis of Java, Learning JS is particularly easy, remember more than three, do more things, more internet search information, think more. JS and Chess is a truth. To achieve the final result, it is important to pay attention to each method, the use of each event, not to say you know how to use every thing, but to understand each event, each method has a link between.

Learn JS, fast two months of time, intermittent look at the point of the foundation. But every time when doing homework feel code like squeeze toothpaste, but listen to the teacher's comments smattering after the new knowledge points have problems. ButWell, it's good to get into something useful.Unconsciously learned to do the project, and later found that the code is more cumbersome, the most annoying is t

Learn Node.jsnode: From the browser run JS, run on the server Chrome-based V8 engine that uses V8 virtual machines to parse and execute JS code To create a simple server: To create a server.js file$ Touch Server.js Loading module HTTP using the Require function Call the Http.createserver () function to create the server Call

and setting its properties to be non-configurable, you can also set all of its own data properties to read-only (if the accessor property of an object has setter methods, accessor properties are unaffected and can still be called by assigning values to the property). Use Object.isfrozen () to detect whether an object is frozen.Object.preventextensions (), Object.seal (), and Object.freeze () all return incoming objects, that is, they can be called by means of nested functions:Creates a closed o

One. Write a JS step1, first realize the layout2. In the implementation principle3. Understanding JS SyntaxTwo. js how to get elements1. Get elements by ID namevar variable = document.getelementbyidx_x ("id name");//element: ElementThree. Move an element out of your sight1.display:none; Show None2.visibility:hodden;Hide3. Set Width/height to 04. Transparency is 0

and B are recycled by GC. (The garbage collection mechanism of Javascript will be described in detail later) 3. microview of the world in the closure To learn more about closures and the relationship between function a and nested function B, we need to introduce several other concepts: the function execution environment (excution context), and the activity object (call object) scope and scope chain ). The process from definition to execution of funct

It is an important concept of Javascript to let you learn about JS closure every minute. For Beginners, closure is a very abstract concept, especially the definition given by ECMA specifications. If you have no practical experience, it is difficult to understand it by definition. Therefore, this article will not describe the concept of closure in a large space, and let you

Original: "Gold Map API" from scratch to learn the German JS API (ii) Map control and plug-in-ranging, circular editor, mouse tools, map type switch, eagle eye fish BoneAbsrtact: Whether it is a control or plug-in, is based on a first-level API interface, the development of two, encapsulated a series of more convenient for developers to use, reduce the developer workload of the level two API interface. In a

Window global object and points this variable to the Obj object, where the global variable JView references obj. The function in the Obj object also references the variable viewport in function f, so the viewport in function f is not recycled by GC and viewport is kept in memory, so this writing satisfies the condition of the closure.4, the Simple summary languageThis is the simplest understanding of closures, of course, the closure has its deeper understanding, this involves more, you need to

/Typing command CTRL + C terminate the program, we change the JS file output content into Chinese characters (such as: Hello), and run JS file again, you will see Chinese contentThree. AnalysisWe need to build an HTTP server (such as PHP Apache and. NET IIS, etc.) to display content on the page, which is browser access.Nodejs only needs to introduce the HTTP module (and of course there are other kinds of of

closures in loopsTake a look at the following example:This function returns an array of functions. On the surface, it seems that each function will print its own index value. But actually each function prints 10. Because each function refers to the same variable i. When the Foo () function returns, the value of I becomes 10, so each function executes with a result of 10.By creating another anonymous function, you can make the behavior of the closure conform to expectations.Performance issuesAft

JS magic Hall: learn more about instanceofI. Breif we all know that instanceof is generally used to check whether the object A is an instance of Class B or A subclass. The problem is that JS does not have the concept of class, nor does it have the concept of class inheritance (although there are constructors). So how does instanceof determine that object A is a B

: ' CourseID ', TextField: ' Coursename ', method: ' Get ', Onloadsuccess:onloadsuccess, Onselect:function (REC) {//Check the exam name according to the course ID $.get ('/examine E/queryexambycourseid ', { ' CourseID ': rec. CourseID, ' OrganizationName ': Encollege}, function (data) {Examname.combobox ("clear"). ComboBox (' LoadData ') , data); Classname.combobox ("clear"); }, ' json '); } }); Test name var examname = $ (' #ExamName '). ComboBox ({valuefi

Every day, Bootstrap is a required js plug-in. Bootstrap comes with 12 jQuery plug-ins. With extended functions, you can add more interactions to the site. If you are interested, refer 1. Bootstrap plug-in overview The components discussed in the previous layout components section are just the beginning. Bootstrap comes with 12 jQuery plug-ins, which provide extended functions to add more interactions to the site. Even if you are not a senior JavaScr

The daily required Tab plug-in of Bootstrap. You can use this plug-in to place the content on a Tab, capsule Tab, or even a drop-down menu Tab, if you are interested, you can refer to tabs. By combining some data attributes, you can easily create a Tab page. "If you want to independently reference the plug-in function, you need to reference tab. js. Alternatively, as mentioned in the Bootstrap plug-in overview chapter, you can reference bootstrap.