Programmer Think

preface All objects in JavaScript are from Object; All objects from Object Prototype inherits methods and properties, which of course may be overridden. This article mainly introduces several methods of creating objects. 1. Object literal {...} Object literal is one of the most commonly used methods, which uses curly braces containin ...

15, Array basis, array method, array sorting 1, Array basis 1.1 three ways to declare arrays It is recommended to create arrays in the form of array literals var arr1 = []; //array literal // The system's built-in Array constructor declares an Array var arr2 = new Array(); //Not recommended var arr3 = Array(); //Not used All arrays (reg ...

Common methods of string There are many methods of string, but there are only those commonly used. Some of them have not been used. Here is a brief introduction 1.charAt(index): returns the values specified in the following table. The returned value is a new string without affecting the original string let str = 'hello'; let newStr = str.cha ...

VUE -- use VUE print NB to realize printing function 1, Install Vue print NB There are no preconditions. You can install it directly, but because vue2 0 and vue3 0 has different usages, so the versions to be installed are also different. Please choose by yourself. Vue2. Version 0 installation method: npm install vue-print-nb --save Vue3. ...

let uid = 0; class Watcher { constructor () { this.id = ++uid; } update () { console.log('watch' + this.id + ' update'); queueWatcher(this); } run () { console.log('watch' + this.id + 'View updated～'); } } let callbacks = []; let pending = false; function nextTick (cb) { callbacks.pus ...

I'm almost finished. I've sorted out some nodes JS + MySQL notes. fs module fs common methods const fs = require('fs') // read file // fs.readFile(path[, options], callback) // options: indicates the encoding format to read the file (optional). If not selected, it is output as a Buffer object // Callback: after reading the file, get the r ...

Author: Ashish LahotiTranslator: front end XiaozhiSource: dmitripavlutinMany developers like the ruby programming language because it has a rich library of standard utilities. For example, arrays in Ruby have a large number of methods.However, our JavaScript is also working hard to gradually enrich its standard library in terms of strings and a ...

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catalogue 1, Binary search tree 2, Operation and implementation of binary search tree   1. insert data   2. Traversing binary search tree         (1). Preorder traversal         (2). Medium order traversal         (3). Postorder traversal   3. Maximum and minimu ...

catalogue I event processing 1.CDN 2. Baidu resource library 3. Code II Animation function III jQuery plug-in IV jQuery encapsulation principle 1. Advantages of closures 2. Code V case   I event processing 1.CDN The full name of CDN is Content Delivery Network, that is, content distribution network. CDN is an intelligent virtua ...