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Some array methods have been added in ES6 forEach(): used for looping arrays map(): used to process arrays some() and every(): used to judge whether it is correct filter(): used to filter arrays reduce(): used to process arrays 1, forEach() forEach is used to traverse the array, which is basically the same as that of the for loop const ...

Today is an overview of the event!! 1, jQuery event registration 2, jQuery event handling 1. Event handling on() binding event 2. Event handling off() unbinding event 3. Event handling trigger() automatically triggers events 3, Today's summary 1, jQuery event registration JQuery provides us with a convenient event registration mech ...

ES6 Attribute 1: let declaration The variables declared by var are global, registered at initialization, and have no block level scope restrictions. Even if they are declared in a block, they will pollute the entire js scope, while let is a local variable and is only valid within the block scope Code explanation: var a=1; { v ...

prefaceHello, I'm Lin Sanxin. Speaking the most difficult knowledge in the most easy to understand words is my motto. The foundation is advanced, and the premise is my original intention.It is necessary for us to connect the front-end interface with the back-end interface, but many students may ignore a possible problem in the docking process - ...

prefaceThis chapter describes numerical extensions. Many new methods are added, some of which are not commonly used.Link to the original text of this chapter: Numerical extensionBinary representationES6 provides a new way to write binary and octal values, which are represented by prefixes 0b (or 0b) and 0o (or 0o) respectively.Octal is no longe ...

Before ECMAScript 6, you can use the Object attribute of the Object as the key, and then use the attribute reference value to store the key/value; In ECMAScript 6 specification, Map and WeakMap are added to store key/value.MapThe new Map collection in ECMAScript 6 can create an empty Map using new and Map constructors:const map = new Map();You ...

catalogue Write a callable function. Each call can increase the value of num by 1 Determine the prime number between 100 and 200 Judge leap years between 1000 and 2000 Using dichotomy to find ordered arrays Write a callable function. Each call can increase the value of num by 1 Tip: it is necessary to use address transfer call (point ...

prefaceIn the last article, we implemented a general scaffolding tool for Web engineering to quickly build projects. In the actual development, especially the background management system, there are many similar code implementations. Therefore, we can continue to implement a tool to quickly generate web code templates, saying goodbye to copy / ...

thinking The overall idea is to draw many small dots on the canvas, then start a timer to move all small dots, and monitor the mouse position at the same time. When the mouse position and the position of small dots are less than a set value, they are connected by a straight line. In this way, we can achieve a sky full star effect in the voice ...

Promise object 1. Basic usage Promise object is a constructor used to generate promise instances var promise = new Promise(function(resolve,reject){ //...some code }) Promise constructor accepts a function as a parameter. The two parameters of the function are resolve and reject. They are two functions provided by the JS engine wit ...