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Koa – register login interface implementation notes 1, Construction project Write a basic app. Note: use must receive a function as middleware //Import koa module const Koa=require('koa'); //Create koa instance const app=new Koa(); //Writing Middleware app.use((ctx,next)=>{ ctx.body+='hello koa' }) //Listening port app.listen(300 ...

preface The official version of wangEditor v5 will be released soon. In order to verify its extensibility, I have developed several common third-party plug-ins. This article introduces the design and use of formula plug-in. To insert a mathematical formula, you need to use LateX syntax, and the rendering formula needs to rely o ...

summary Difference between synchronous and asynchronousEvent loop and message queue, that is, how to implement asynchronous modeAsynchronous programming modePromise asynchronous scheme, macro task / micro taskGenerator asynchronous scheme, async / wait syntax Synchronous mode Execute line by lineblock Asynchronous mode Do not wait for the ...

note Scaffold file structure ├── node_modules ├── public │ ├── favicon.ico: Tab Icon │ └── index.html: Main page ├── src │ ├── assets: Storing static resources │ │ └── logo.png │ │── component: Store components │ │ └── HelloWorld.vue │ │── App.vue: Summarize all components │ │── main.js: Entry file ├── .gitignore: git Con ...

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String: a global object is a constructor for a string or a sequence of characters. The following lists several properties and methods commonly used by String objects. Properties: The length property indicates the length of a string. let string="hello" document.write(string.length)//Return to 5 method: The charAt() method returns the spec ...

explain Learning notes of browser working principle and practice column Why async / await Let's start with a request for remote resources using fetch: Ruan Yifeng's Weblog: Fetch API tutorialMDN: Fetch API fetch request example fetch('https://www.geekbang.org') .then((response) => { console.log(response) return fetch('http ...

(1) Conversion of data types 1, Introduction to data type conversion In the program, there are often inconsistent data types, and data type conversion is required if the expected results are not obtained 1. Transfer from other types to number 1.1 string type to number console.log(Number('123')); //Convert string 123 to 123 1.2 integer: par ...

7. Convert to array Sometimes we have to convert some other data structures, such as sets or strings, into arrays. Class array: function parameters, dom collection Array.prototype.slice.call(arguments);Array.prototype.concat.apply([], arguments); character string: console.log('string'.split('')); // ["s", "t", "r", "i", "n", "g"]console.lo ...

1, do expression In essence, a block level scope is a statement that encapsulates multiple operations without a return value. { let t = f(); t = t * t + 1; } In the above code, the block level scope encapsulates the two statements together. However, there is no way to get the value of T outside the block level scope, because the block l ...