firebase node js tutorial

starting position of the file read, and if the value of position is NULL, it is read from the position of the current file pointer.Callback-callback function, there are three parameters err, Bytesread, Buffer,err is the error message, Bytesread represents the number of bytes read, and buffer is the cache object.7. Close the file:Fs.close (FD, callback)This callback finally has no parameter!!!8. Interception of documents:Fs.ftruncate (FD, Len, callback)The parameters use the following instructio

Original link: Node-webkit tutorial (15) Debug typescriptThe content of this article also applies to the Chrome browser.In the configuration item for the Chrome developer tool, there is a sourcemap option to configure the JavaScript source and generate code relationships. If you can debug the typescript code directly in the browser, we can really appreciate the joy of typescript development.First open the C

What should we do when we get a DOM node and want to insert a new DOM within this DOM node?If the DOM node is empty, for example, then the innerHTML = ‘ content of the DOM node can be modified directly, equivalent to "inserting" a new Dom Node.If the DOM node is not empty,

Translation Three. js is a great open-source WebGL library. WebGL allows JavaScript to operate on GPUs and implement 3D in the browser. However, this technology is still in its development stage, and there is a shortage of materials. Fans should learn it through the Demo source code and the source code of Three. js.0. Introduction Previously, I have provided an article titled getting started with Three.

Express. js is an MVC development framework of nodejs and supports multiple templates such as jade. Next, let's talk about the installation of express and the configuration of the app. js file. In the future tutorial, we will use express. js to build a chat room step by step. Install express.

Article Introduction: JS in Browser Compatibility Tutorial: Dom method and object reference. 1. getElementById "Analysis Notes" to first look at a set of code:Value= "Click Me" ōnclick= "alert (id.value)"/> In Firefox, the button does not respond, in IE, you can, because for IE, the ID of an HTML element can be used directly in the script as a variable name, but not in Firefox. "Compatibility p

Pdf. js tutorial The charm of the pdf. js framework is implemented for HTML5, without any local support, and the browser compatibility is also good. There is only one requirement: the browser supports HTML5! (However, for earlier versions of IE, we can only mourn !) It is said that IE9 and above are OK, because I use IE11 locally, so I only tested it on IE11 and

This article for H5EDU institutions official HTML5 training courses, the main Introduction: JavaScript reinforcement tutorial-Cocos2d-JS screen adaptation solution 1. set the screen adaptation policy (ResolutionPolicy) If you have not... this article is H5EDU official HTML5 training courses, mainly introduces: JavaScript reinforcement tutorial-Cocos2d-

The Vue. js component uses the Development Instance tutorial component. Components can expand HTML elements and encapsulate reusable code. at a high level, components are custom elements and vue. the js compiler adds special functions for it. In some cases, components can also be in the form of native HTML elements and can be extended with the is feature. The V

Document directory What is an ext plugin ?) Steps for adding a function (Approaches to adding functionality) Implement a plug-in implementing a plugin A fieldlabeler plugin Summary November 11,200 9 by Nigel white Translation: Frank Cheung (zhangxin)Ext js advanced plug-in development tutorial advanced plug-in development with ext JS When creating a c

end of the implementation of the component reuse, here we also write an example, the code is as follows:Here we create a search component, and then we create a page component, and then we call the search component in the page component, and we call two times, where we pass the value through the property searchtype, and we finally show the resultVi. Summary of ReactjsAbout Reactjs today first learned here, the following to summarize, the main points are as follows:1. Reactjs is based on componen

textContent all the text is returned. Also note that ietextContent .Modifying CSS is also a frequently needed operation. The properties of the DOM node style correspond to all of the CSS, which can be directly obtained or set. Because CSS allows font-size such a name, it is not a valid JavaScript property name, so it needs to be rewritten in JavaScript as a camel-named fontSize :// 获取p id="p-id">...p>var p = document.getElementById(‘p-id‘);// 设置CSS:p

JavaScript: several methods for JS to obtain HTML elements in a webpage. Javascript tutorial GetElementById getElementsByName getElementsByTagName GetElementById, getElementsByName, getElementsByTagName The last two are the collection, and the byid is only a single object. GetElementById usage For example: Taoba Reference Method on the same page: 1. Use id: Link1.href, return a http://homepage.yesky.com 2

With the website features gradually enriched, the page JS also become more and more complex and bloated, the original through the script tag to import a JS file this way has been unable to meet the current Internet development model, we need team collaboration, module reuse, unit testing and a series of complex needs.Requirejs is a very compact JavaScript module loading framework and is one of the best impl

cookies httpOnly .HistoryhistoryThe object holds the browser's history, and JavaScript can invoke the history object back() or the forward () user clicks the browser's back or forward button.This object belongs to the historical legacy, and for modern web pages, a simple and brutal invocation can be very annoying to users because of the large use of Ajax and page interactions history.back() .When a novice starts designing a Web page, he likes to call when the login page is successful history.ba

1. Setting the screen adaptation policy (Resolutionpolicy) If you haven't used Resolutionpolicy, Just after the game loading process is complete (in the Cc.game.onStart function callback), call the following code: Cc.view.setDesignResolutionSize (320,NBSP;480,NBSP;CC. Resolutionpolicy.show_all); The first two parameters of the Setdesignresolutionsize function are the game resolution you want to use in your code, and the third parameter is the adaptation scheme you choose. There are 5 adaptation

As the site functions gradually rich, the page JS also become more and more complex and bloated, the original script tags to import a JS file this way has not been able to meet the current Internet development model, we need team collaboration, module reuse, unit testing, and so a series of complex needs. Requirejs is a very compact JavaScript module loading framework, one of the best implementations of AMD

Original addressWe learned about the creation of maps and markers in the front. So today we're going to learn how to display a window on a map (Infowindow)The Infowindow constructor is:Infowindow (opts?:infowindowoptions). The infowindowoptions Object Specifies the initialization parameters that are used to display the information window. Infowindowoptions Object Properties:content: contains a text string or displays a DOM node in the Information wind

Today when doing discuz template, use jquery and the original theme JS conflict. This is mostly Discuz x uses $ (ID) as the Fetch method for the DOM node, and the $ symbol just happens to conflict with jquery's default symbol.The following are workarounds based on previous discuz x and jquery conflicts. For everyone to make a reference!The jquery js file jquery-1

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.