JavaScript

1 JavaScript variable scope1.1 Function scopeThere is no block scope: The scope is not surrounded by {}, and its scope is determined by the function, so the curly brackets in the statement such as If/for are not separate scopes.As mentioned above,

typeof all Return ObjectAll data types in JavaScript are strictly objects, but in practice we still have types, if we want to determine whether a variable is an array or an object using TypeOf, because it all returns object 123456

Rx Learning Note: JavaScript array operations 2016-07-03 additions and deletions elementsUnshift () Adding elements to an array switchArray.unshift ("value"); Array.unshift (123); Array.unshift ("value1", "value2");Push () Adds an element at the end

A global variable and a local variable global variable: (1) inside a variable (2) method declared outside the method, there are no variables declared with the VAR keywordLocal variables: Inside the method, variables declared with VarResults:If you

One, Dom object control HTML 1. Method:Getelementsbyname () Gets the namegetElementsByTagName () Gets the elementGetAttribute () Get element propertiesSetAttribute () setting element propertiesChildNodes () Access child nodesParentNode () Accessing

1. Use a For loop to traverse the videos and bookmarks array at the same time. For each video and bookmark pair, create a {videoid, bookmarkid} pair and add it to the Videoidandbookmarkidpairs array.function () {varVideos = [ {

JavaScript Data Validation Class/*JavaScript: Authentication class Author: Yang Bo date:201603231, User name authentication 2, password Authentication 3, repeat password verification 4, mailbox verification 5, mobile phone number verification 6,

Break statement Use the break statement to terminate the loop. Continue statements use the Continue statement to terminate the current loop, and then proceed from the next value. JavaScript Break and

CSS margin knowledge point and CSS margin knowledge point1. Percentage value of margin Percentage of common elements relative to the containerElement width). Here we set a container with a width and height of 800*600 on the outside of the image. Set

JQuery basics-knowledge points are required for entry. jquery Basics What is the format of the causal relationship of jQuery events: $ ("Button"). click (function (){}) [Officially contact jQuery] (1) jQuery writing steps:1. Introduce the jQuery

Jquery sets the form element as a simple code that is unavailable. jquery forms This section describes how to set form elements to unavailable using simple instance code. The code example is as follows: helping customers website name:

JQuery achieves the display and hiding effects of the left-side navigation module. This article describes how jQuery can display and hide the left navigation module. We will share this with you for your reference. The details are as follows: 1.

CSS block-level elements and row-level elements (reprinted) and css-level elements A block element generally starts from a new line. It can accommodate inline elements and other block elements. A common block element is the section tag 'P ". The

JavaScript for Loop closure and javascript A netizen asked a question, the following html, why is the output every time 5, rather than clicking every p, alert generates the corresponding 1, 2, 3, 4, 5. closure demonstration product 1

How can we solve the problem that div content is not covered ?, Div Overwrite 1. In the div layout of the upper and lower structures, the div may overwrite the div, but the content is not covered. Let's look at an example. 1: 2: 3: 4:

Form Items, web form items Overview, blog posts often don't take long before they are removed from the homepage due to insufficient space or depth (a little sad), but I won't give up on it. I will try to improve my skills and step by step, lay a

JS operation JSON method summary (recommended), jsjson JSON Overview: JSON (JavaScript Object Notation) is a lightweight data exchange format. It adopts a completely language-independent text format and is an ideal data exchange format. JSON is a

Jquery-based event operations An event is triggered when a user loads a page or page to complete interaction between javascript and HTML. Common Element click events, mouse events, keyboard input events, and so on. Compared with JQuery, the basic

In-depth analysis of JS array Traversal method (recommended), analysis of js All the friends who have used Underscore know that it has a perfect API for Array (SET) traversal that can be called. _. each () is one of them. The following is a simple

Examples of sorting JavaScript Object Arrays In javascript, multi-dimensional arrays and object arrays are sorted by native sort () methods. The basic usage is not mentioned. Let's take a look at a simple sorting example: //Sortalphabetically and