JavaScript

Recently encountered a problem that is difficult to solve; a simple JS addition operation expression:1 // add an empty array here to get what???Answer: ' 1 ';Why the answer is 1, I was very confused at first; I read an article before I learned that

Turn fromHttp://www.blogbus.com/kingslay-logs/216353709.html Shift () Definition and usageThe shift () method removes the first element from the array and returns the value of the first element.Syntax: Arrayobject.shift ()Return value: The value of

NET + Offline Salon | Mobile app Mode innovation: give you a reason to do the app >>Good API design: In the self-description, at the same time to achieve abstract goals.Well-designed APIs allow developers to get started quickly, without the need to

We treat the named parameter (arguments) as a local variable, and when passing a primitive type value to a parameter, passing a copy like a copy of a primitive type variable, the change inside the function does not affect the external base type

General IndexOf and if-judging notation:1 if ("112233". IndexOf (">-1"){2 console.log ("very two"); 3 }else {4 console.log ("Why not Two"); 5 }Whether the above code is our usual writing JS logic when the most commonly used to write, do you

The OnLoad event, as the name implies, is for the JS program to execute after the Web page is loaded successfully. It is necessary for JS to be placed in the head.How to bind the Web page onload, there are three main ways:Window.onload=function () {/

The idea of archetypal inheritance is that borrowed prototypes can create new objects based on existing objects, while not creating custom types.To achieve this, the following functions are given:function Object (o) { function F () {}

People with JS should know the eval () function, although the function is very small, but it is powerful, then the question, why not used? The reason is simple, because the eval () function is the dynamic execution of the string in which there may

DOM ProgrammingThe important role of 1.js is that it allows users to interact with page elements-->js essence"2.DOM programming is also the basis of Ajax3.DOM (Document Object model), which is an application programming interface (API) for HTML and

Javascript Speed OptimizationJavaScript Speed Optimization Fundamentals1. Choose the weight to avoid light, some choiceGenerally speaking, the system is all huge, not too perfectionist, first grasp the focus, understand those are our core pages,

1 , creation of arraysvar arrayobj = new Array (); Create an arrayvar arrayobj = new Array ([size]); Create an array and specify the length, note not the upper limit, is the lengthvar arrayobj = new Array ([element0[, element1[, ...　[, ELEMENTN]]]);

Chapter Content Using " string anywhere in your code. For example, when the browser loads the code shown below, it generates an error:");}Because by parsing embedded code rules, when the browser encounters the string "", it is considered to

NullIn JavaScript, null means "nothing".Null is a special type with only one value. Represents an empty object reference.var person = {firstName: "John", LastName: "Doe", Age:50, Eyecolor: "Blue"}; var NULL ;d Ocument.getelementbyid (typeof

What is a design pattern?Design patterns are a set of reusable, most known, categorized purposes, Code design experience Summary . Design patterns are used in order to reuse code, make code easier for others to understand , and ensure code

The company has no project recently. So fortunately learn JS. After all, many people are the same as me. The JS Foundation is also very poor.The interviewer asks you when you are interviewing. You will JS not. You will not hesitate to answer the

Module mode is a common encoding pattern for JavaScript. This is a general understanding, but there are some advanced applicationsDid not get much attention. In this article, I'll review the basics, browse some good advanced techniques, and even I

Regular Expressions:Regular Expressions (Regular expression), also known as formal notation , conventional notation .A regular expression uses a single string to describe and match a series of strings that conform to a certain syntactic rule.Method:1

Don't say a word; first a piece of code;var scope= ' global ';function Test () {alert (scope); Output undefine, not globalvar scope= ' local ';alert (scope); Output Local}Test ();You may think that the first alert will output global;But in fact the

CSS3 radial gradient ---- big fish eat small fish alone, css3 radial I recently fell in love with fishing, but I couldn't catch a big fish. So I drew a big fish to comfort my weak soul. First: First, let's take a look at the whole fish. .fish{

Simple Seajs documentation provides a simple and ultimate modular development experience and seajs Modularization Non-official documents are organized to provide text and examples of their official documents for quick query. Why is Sea. js used? Sea.