JavaScript

The eval () function parses a string into JavaScript code execution.var str = "alert (' Hello World ');"　　; alert (str); alert (' Hello World ');eval (str); Hello WorldThe eval () function is commonly used to parse a JSON string into a JSON

The digitized date JS, date is a built-in data type, although the direct output of the date format for people to read, but for the machine program is a bit inconvenient:var now=New Date (); Console.log (now); // Wed Nov 22:02:17 gmt+0800

It is entirely up to your personal habits to add and not add semicolons, but it is recommended to use semicolons for code stability (parsing errors).JavaScript auto-semicolon rule:1. When there are newline characters (including multiline comments

The son said: "Wen so know new, can for the teacher." Confucius said: "Brush up on old knowledge to learn new understanding and experience, with this point can become a teacher." "In particular, we have a program, whether it is a full stack of

Summary of common JavaScript array algorithmsWhether in the interview or in the written test, we are often asked about the JavaScript array of some algorithms, such as array de-weight, array intersection, array scrambling and so on. Take some time

Null: indicates no value;Undefined: Represents an undeclared variable,Or a variable that has been declared but not assigned a value,Or an object property that does not exist.The = = operator considers the two equal. If you want to differentiate

One: An array of common methods:1:join ();Converts an array to a string display. The parameter is not entered, the default is a comma connection, and the input parameter is concatenated with the parameter.var arr=[1,2,3];console.log (Arr.join ());

Method One://An extension to date that converts date to a string of the specified format//the Month (m), Day (d), hour (h), Minute (m), second (s), quarter (q) can be used with 1-2 placeholders,//year (Y) can use 1-4 placeholders, milliseconds (S)

First of all, the inevitable classics, what is the function of the curry (from Baidu):in Computer science, currying is a technique that transforms a function that accepts multiple parameters into a function that takes a single parameter (the first

In our usual development process, we are bound to encounter this situation: both simple objects and complex objects composed of simple objects, these simple objects and complex objects will be combined into a tree structure, when the client

A study record of advanced JavaScript programming (II)Referring to the object, from the last summary can be concluded that the basic type has number,boolean,undefined,string,null, and there are many types of reference, and now introduce some

Definition of a singleton pattern: guarantees that a class has only one instance and provides a global access point to access it. Singleton mode is a common pattern, and there are some objects that we often only need one, such as a thread pool, a

Implementation Method of the Binary Search Tree for javascript data structure, javascript Data Structure This article describes how to implement the javascript Binary Search Tree. We will share this with you for your reference. The details are as

Sass Control Command (loop) and sass control command Loop @ If@ IfA command is a SassScript that can process style Blocks Based on conditions. If the condition isTrueReturns a style block.FalseReturns another style block. In addition to @ if, Sass

HTML design mode learning notes, design mode learning notes This week, I mainly learned the HTML design model. Now I will summarize my learning content as follows:   I. Learning the Box Model CSS has a basic design model called the box model, which

Basic Webpack usage and Webpack usage   This article provides an example of the fundamentals of Webpack. ■ What is Webpack   ● Module bundler● Module with dependencies● Module generates static assets   ■ Why Webpack   ● Good for development but also

A summary of javascript learning every day (Array), javascriptarray 1. Common array Methods var colors = ["red", "blue", "green"]; //creates an array with three strings alert(colors.toString()); //red,blue,green alert(colors.valueOf());

Javascript provides the five-star rating function and javascript five-star rating This article shares with you the sample code for implementing the five-star scoring function in javascript. For more information, see the following. Before sharing the

A preliminary understanding of javascript object-oriented, a preliminary understanding of javascript Preface Class-based objects: we all know that object-oriented languages have an obvious sign that they all have the concept of classes, you can

Analysis of substring and substr methods in js, substringsubstr 1. substring method:Used to extract the character substring (start, end) between two specified subscripts of a string) Start and end locations, index starting from scratch Parameter