Programmer Group

This article casually wrote about my own understanding of websocket communication protocol, Demo played on two frameworks, and then stepped on several pits and unfilled pits (welcome to comment and guide).   What is WebSocket? Why use WebSocket? WebSocket is a kind of network communication protocol. When it comes to network communication protoc ...

vue language is used, and component of element is used. To make an online editing code, code content is required to be input, highlighted display can be carried out, different languages can be switched, keyword completion is supported, and a code left-right comparison between different versions is required. As for why codemirror is selected, pl ...

HTML5+tracking.js for brush payment Recently, brushing payments have become so popular that bosses are sure to keep up with the times, so there's a brushing payment program.The key technologies for front-end implementation are camera video recording, photo taking and face matching. This article will discuss how to achieve face brushing payment ...

When there are many options, switch is more convenient than if else. The syntax is as follows: 1 switch (expression) 2 { 3 case value 1: 4 execution code block 1 5 break; 6 case value 2: 7 execution code block 2 8 break; 9 ... 10 case value n: 11 execution code block n 12 break; 13 default: 14 code executed at the same time as c ...

The idea of pull-up loading Pull up loading is to trigger ajax event request data when the screen is pulled to the bottom 2. All the codes below the height of the document and the height of the scroll to get the height of the screen are compatible and can be used directly Javascript: alert(document.body.clientWidth); //Page visible area ...

Preface When we use the ArcGIS JS API, we will encounter entering a name in the text box, querying the element, and realizing the function of finding the element. Get ready Deploy ArcGIS JS API locally / call online API Local deployment of ArcGIS JS API Publish a good dynamic map service http://blog.csdn.net/idomyway/article/details/792 ...

Preface When we use the ArcGIS JS API, we will meet the requirement of clicking to find the element attributes. Spatial query of map can be realized through IdentifyTask in ArcGIS JS Get ready Deploy ArcGIS JS API locally / call online API Local deployment of ArcGIS JS API Publish a good dynamic map service http://blog.csdn.net/idomyway/a ...

Life cycle function refers to the function that the component will automatically execute at a certain time constructor can be regarded as a common life cycle function of a class, but it is not a unique life cycle function of react render() is a function that automatically executes when the data changes, so it belongs to the life cycle function ...

The previous several articles are all long speeches. It's really a bit hard to read them all at once. Today, I'd like to share a skill of using attr() in development. Maybe we haven't used it like this. It works with the template string module in the ES6 standard. Let's take a look at the template string and its use: // Conventional JavaScript ...

Wechat applet wx.request RequestTask wx.request(Object object) initiates an HTTPS network request. Sample code wx.request({ url: 'test.php', //Example only, not real interface address data: { x: '', y: '' }, header: { 'content-type': 'application/json' // Default value }, success (res) { console.log(res.data) } }) ...